How to solve in terms of one variable with an equation involving two variables?
$begingroup$
So I have been dealing with an extremely difficult equation: $x^{2a} = frac{x}{a}$ and am confused on how to solve it. I am wondering how to solve for $x $ in terms of $ a$ in the case of this question. If possible, give an explanation of the answer.
random-variables
$endgroup$
add a comment |
$begingroup$
So I have been dealing with an extremely difficult equation: $x^{2a} = frac{x}{a}$ and am confused on how to solve it. I am wondering how to solve for $x $ in terms of $ a$ in the case of this question. If possible, give an explanation of the answer.
random-variables
$endgroup$
add a comment |
$begingroup$
So I have been dealing with an extremely difficult equation: $x^{2a} = frac{x}{a}$ and am confused on how to solve it. I am wondering how to solve for $x $ in terms of $ a$ in the case of this question. If possible, give an explanation of the answer.
random-variables
$endgroup$
So I have been dealing with an extremely difficult equation: $x^{2a} = frac{x}{a}$ and am confused on how to solve it. I am wondering how to solve for $x $ in terms of $ a$ in the case of this question. If possible, give an explanation of the answer.
random-variables
random-variables
edited Jan 6 at 4:56
Martund
1,575212
1,575212
asked Jan 6 at 4:41


JamesJames
264
264
add a comment |
add a comment |
4 Answers
4
active
oldest
votes
$begingroup$
$$x^{2a}=x/a$$You can divide both sides by $x$ to get $$frac{x^{2a}}{x}=frac1a$$Use index rules to get $$x^{2a-1}=frac1a$$Then raise both sides to the power $frac1{2a-1}$ to get $$x=left(frac{1}aright)^{frac1{2a-1}}=a^{frac1{1-2a}}$$
$endgroup$
$begingroup$
How can Hello World's answer be simplified to your answer?
$endgroup$
– James
Jan 6 at 5:03
$begingroup$
$$e^{frac{ln a}{1-2a}}=(e^{ln a})^{frac1{1-2a}}=a^{frac1{1-2a}}$$Since $e^{ln a}=a$ by the fact that these are inverse functions of each other.
$endgroup$
– John Doe
Jan 6 at 5:04
add a comment |
$begingroup$
I am assuming you want to solve:
$$x^{2a} = frac{x}{a}implies 2aln(x)=ln(x)-ln(a)implies ln(x)=frac{ln(a)}{1-2a}$$
$$implies x=e^{frac{ln(a)}{1-2a}} = left(e^{ln a}right)^{{1/(1-2a)}}=a^{frac{1}{1-2a}}.$$
Another way would be to do:
$$x^{2a} = frac{x}{a}implies x^{2a-1}=a^{-1}implies x=a^{frac{1}{1-2a}}.$$
$endgroup$
$begingroup$
Which can be simplified to $a^{frac1{1-2a}}$. :)
$endgroup$
– John Doe
Jan 6 at 4:59
$begingroup$
How can this be simplified to your answer John Doe?
$endgroup$
– James
Jan 6 at 5:01
2
$begingroup$
My guess is: $$e^{ab} = (e^a)^b$$ Take $a$ to be the expression with the natural log here
$endgroup$
– Eevee Trainer
Jan 6 at 5:03
$begingroup$
Hello World, is there not a difference between a and e though?
$endgroup$
– James
Jan 6 at 5:04
$begingroup$
Also, in the last step of the second way to complete the equation, how can x^(2a-1)=a^-1 become x=a^(1/(1-2a))?
$endgroup$
– James
Jan 6 at 5:07
|
show 1 more comment
$begingroup$
We have,
$$x^{2a}=frac{x}{a}$$
We see that $x=0$ is always a solution.
Now, if $aneqfrac{1}{2}$, then,
$$Longrightarrow x^{2a-1}=frac{1}{a}$$
$$Longrightarrow x=a^{frac{1}{1-2a}}$$
where both positive and negative solutions will come if $2a-1$ is even integer.
For $a=frac{1}{2}$, $x=0$ is the only solution.
Hope it is helpful:)
$endgroup$
$begingroup$
Sorry, I forgot to mention that x>0 and a>1.
$endgroup$
– James
Jan 6 at 5:06
$begingroup$
Ok then, ignore that for $a=frac{1}{2}$ and consider only positive solutions for $x$.
$endgroup$
– Martund
Jan 6 at 5:08
$begingroup$
How is the second to last step translated into the result?
$endgroup$
– James
Jan 6 at 5:10
$begingroup$
Take power $frac{1}{2a-1}$ on both sides, and apply $(m^p)^q=m^{pq}$ on both sides.
$endgroup$
– Martund
Jan 6 at 5:14
$begingroup$
So then on the side of x, the power of x would be 1?
$endgroup$
– James
Jan 6 at 5:15
|
show 1 more comment
$begingroup$
This may be the way to proceed:
Hope this helps.
$endgroup$
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
$$x^{2a}=x/a$$You can divide both sides by $x$ to get $$frac{x^{2a}}{x}=frac1a$$Use index rules to get $$x^{2a-1}=frac1a$$Then raise both sides to the power $frac1{2a-1}$ to get $$x=left(frac{1}aright)^{frac1{2a-1}}=a^{frac1{1-2a}}$$
$endgroup$
$begingroup$
How can Hello World's answer be simplified to your answer?
$endgroup$
– James
Jan 6 at 5:03
$begingroup$
$$e^{frac{ln a}{1-2a}}=(e^{ln a})^{frac1{1-2a}}=a^{frac1{1-2a}}$$Since $e^{ln a}=a$ by the fact that these are inverse functions of each other.
$endgroup$
– John Doe
Jan 6 at 5:04
add a comment |
$begingroup$
$$x^{2a}=x/a$$You can divide both sides by $x$ to get $$frac{x^{2a}}{x}=frac1a$$Use index rules to get $$x^{2a-1}=frac1a$$Then raise both sides to the power $frac1{2a-1}$ to get $$x=left(frac{1}aright)^{frac1{2a-1}}=a^{frac1{1-2a}}$$
$endgroup$
$begingroup$
How can Hello World's answer be simplified to your answer?
$endgroup$
– James
Jan 6 at 5:03
$begingroup$
$$e^{frac{ln a}{1-2a}}=(e^{ln a})^{frac1{1-2a}}=a^{frac1{1-2a}}$$Since $e^{ln a}=a$ by the fact that these are inverse functions of each other.
$endgroup$
– John Doe
Jan 6 at 5:04
add a comment |
$begingroup$
$$x^{2a}=x/a$$You can divide both sides by $x$ to get $$frac{x^{2a}}{x}=frac1a$$Use index rules to get $$x^{2a-1}=frac1a$$Then raise both sides to the power $frac1{2a-1}$ to get $$x=left(frac{1}aright)^{frac1{2a-1}}=a^{frac1{1-2a}}$$
$endgroup$
$$x^{2a}=x/a$$You can divide both sides by $x$ to get $$frac{x^{2a}}{x}=frac1a$$Use index rules to get $$x^{2a-1}=frac1a$$Then raise both sides to the power $frac1{2a-1}$ to get $$x=left(frac{1}aright)^{frac1{2a-1}}=a^{frac1{1-2a}}$$
answered Jan 6 at 4:59
John DoeJohn Doe
11.1k11238
11.1k11238
$begingroup$
How can Hello World's answer be simplified to your answer?
$endgroup$
– James
Jan 6 at 5:03
$begingroup$
$$e^{frac{ln a}{1-2a}}=(e^{ln a})^{frac1{1-2a}}=a^{frac1{1-2a}}$$Since $e^{ln a}=a$ by the fact that these are inverse functions of each other.
$endgroup$
– John Doe
Jan 6 at 5:04
add a comment |
$begingroup$
How can Hello World's answer be simplified to your answer?
$endgroup$
– James
Jan 6 at 5:03
$begingroup$
$$e^{frac{ln a}{1-2a}}=(e^{ln a})^{frac1{1-2a}}=a^{frac1{1-2a}}$$Since $e^{ln a}=a$ by the fact that these are inverse functions of each other.
$endgroup$
– John Doe
Jan 6 at 5:04
$begingroup$
How can Hello World's answer be simplified to your answer?
$endgroup$
– James
Jan 6 at 5:03
$begingroup$
How can Hello World's answer be simplified to your answer?
$endgroup$
– James
Jan 6 at 5:03
$begingroup$
$$e^{frac{ln a}{1-2a}}=(e^{ln a})^{frac1{1-2a}}=a^{frac1{1-2a}}$$Since $e^{ln a}=a$ by the fact that these are inverse functions of each other.
$endgroup$
– John Doe
Jan 6 at 5:04
$begingroup$
$$e^{frac{ln a}{1-2a}}=(e^{ln a})^{frac1{1-2a}}=a^{frac1{1-2a}}$$Since $e^{ln a}=a$ by the fact that these are inverse functions of each other.
$endgroup$
– John Doe
Jan 6 at 5:04
add a comment |
$begingroup$
I am assuming you want to solve:
$$x^{2a} = frac{x}{a}implies 2aln(x)=ln(x)-ln(a)implies ln(x)=frac{ln(a)}{1-2a}$$
$$implies x=e^{frac{ln(a)}{1-2a}} = left(e^{ln a}right)^{{1/(1-2a)}}=a^{frac{1}{1-2a}}.$$
Another way would be to do:
$$x^{2a} = frac{x}{a}implies x^{2a-1}=a^{-1}implies x=a^{frac{1}{1-2a}}.$$
$endgroup$
$begingroup$
Which can be simplified to $a^{frac1{1-2a}}$. :)
$endgroup$
– John Doe
Jan 6 at 4:59
$begingroup$
How can this be simplified to your answer John Doe?
$endgroup$
– James
Jan 6 at 5:01
2
$begingroup$
My guess is: $$e^{ab} = (e^a)^b$$ Take $a$ to be the expression with the natural log here
$endgroup$
– Eevee Trainer
Jan 6 at 5:03
$begingroup$
Hello World, is there not a difference between a and e though?
$endgroup$
– James
Jan 6 at 5:04
$begingroup$
Also, in the last step of the second way to complete the equation, how can x^(2a-1)=a^-1 become x=a^(1/(1-2a))?
$endgroup$
– James
Jan 6 at 5:07
|
show 1 more comment
$begingroup$
I am assuming you want to solve:
$$x^{2a} = frac{x}{a}implies 2aln(x)=ln(x)-ln(a)implies ln(x)=frac{ln(a)}{1-2a}$$
$$implies x=e^{frac{ln(a)}{1-2a}} = left(e^{ln a}right)^{{1/(1-2a)}}=a^{frac{1}{1-2a}}.$$
Another way would be to do:
$$x^{2a} = frac{x}{a}implies x^{2a-1}=a^{-1}implies x=a^{frac{1}{1-2a}}.$$
$endgroup$
$begingroup$
Which can be simplified to $a^{frac1{1-2a}}$. :)
$endgroup$
– John Doe
Jan 6 at 4:59
$begingroup$
How can this be simplified to your answer John Doe?
$endgroup$
– James
Jan 6 at 5:01
2
$begingroup$
My guess is: $$e^{ab} = (e^a)^b$$ Take $a$ to be the expression with the natural log here
$endgroup$
– Eevee Trainer
Jan 6 at 5:03
$begingroup$
Hello World, is there not a difference between a and e though?
$endgroup$
– James
Jan 6 at 5:04
$begingroup$
Also, in the last step of the second way to complete the equation, how can x^(2a-1)=a^-1 become x=a^(1/(1-2a))?
$endgroup$
– James
Jan 6 at 5:07
|
show 1 more comment
$begingroup$
I am assuming you want to solve:
$$x^{2a} = frac{x}{a}implies 2aln(x)=ln(x)-ln(a)implies ln(x)=frac{ln(a)}{1-2a}$$
$$implies x=e^{frac{ln(a)}{1-2a}} = left(e^{ln a}right)^{{1/(1-2a)}}=a^{frac{1}{1-2a}}.$$
Another way would be to do:
$$x^{2a} = frac{x}{a}implies x^{2a-1}=a^{-1}implies x=a^{frac{1}{1-2a}}.$$
$endgroup$
I am assuming you want to solve:
$$x^{2a} = frac{x}{a}implies 2aln(x)=ln(x)-ln(a)implies ln(x)=frac{ln(a)}{1-2a}$$
$$implies x=e^{frac{ln(a)}{1-2a}} = left(e^{ln a}right)^{{1/(1-2a)}}=a^{frac{1}{1-2a}}.$$
Another way would be to do:
$$x^{2a} = frac{x}{a}implies x^{2a-1}=a^{-1}implies x=a^{frac{1}{1-2a}}.$$
edited Jan 6 at 5:05
answered Jan 6 at 4:57
Hello_WorldHello_World
4,12621731
4,12621731
$begingroup$
Which can be simplified to $a^{frac1{1-2a}}$. :)
$endgroup$
– John Doe
Jan 6 at 4:59
$begingroup$
How can this be simplified to your answer John Doe?
$endgroup$
– James
Jan 6 at 5:01
2
$begingroup$
My guess is: $$e^{ab} = (e^a)^b$$ Take $a$ to be the expression with the natural log here
$endgroup$
– Eevee Trainer
Jan 6 at 5:03
$begingroup$
Hello World, is there not a difference between a and e though?
$endgroup$
– James
Jan 6 at 5:04
$begingroup$
Also, in the last step of the second way to complete the equation, how can x^(2a-1)=a^-1 become x=a^(1/(1-2a))?
$endgroup$
– James
Jan 6 at 5:07
|
show 1 more comment
$begingroup$
Which can be simplified to $a^{frac1{1-2a}}$. :)
$endgroup$
– John Doe
Jan 6 at 4:59
$begingroup$
How can this be simplified to your answer John Doe?
$endgroup$
– James
Jan 6 at 5:01
2
$begingroup$
My guess is: $$e^{ab} = (e^a)^b$$ Take $a$ to be the expression with the natural log here
$endgroup$
– Eevee Trainer
Jan 6 at 5:03
$begingroup$
Hello World, is there not a difference between a and e though?
$endgroup$
– James
Jan 6 at 5:04
$begingroup$
Also, in the last step of the second way to complete the equation, how can x^(2a-1)=a^-1 become x=a^(1/(1-2a))?
$endgroup$
– James
Jan 6 at 5:07
$begingroup$
Which can be simplified to $a^{frac1{1-2a}}$. :)
$endgroup$
– John Doe
Jan 6 at 4:59
$begingroup$
Which can be simplified to $a^{frac1{1-2a}}$. :)
$endgroup$
– John Doe
Jan 6 at 4:59
$begingroup$
How can this be simplified to your answer John Doe?
$endgroup$
– James
Jan 6 at 5:01
$begingroup$
How can this be simplified to your answer John Doe?
$endgroup$
– James
Jan 6 at 5:01
2
2
$begingroup$
My guess is: $$e^{ab} = (e^a)^b$$ Take $a$ to be the expression with the natural log here
$endgroup$
– Eevee Trainer
Jan 6 at 5:03
$begingroup$
My guess is: $$e^{ab} = (e^a)^b$$ Take $a$ to be the expression with the natural log here
$endgroup$
– Eevee Trainer
Jan 6 at 5:03
$begingroup$
Hello World, is there not a difference between a and e though?
$endgroup$
– James
Jan 6 at 5:04
$begingroup$
Hello World, is there not a difference between a and e though?
$endgroup$
– James
Jan 6 at 5:04
$begingroup$
Also, in the last step of the second way to complete the equation, how can x^(2a-1)=a^-1 become x=a^(1/(1-2a))?
$endgroup$
– James
Jan 6 at 5:07
$begingroup$
Also, in the last step of the second way to complete the equation, how can x^(2a-1)=a^-1 become x=a^(1/(1-2a))?
$endgroup$
– James
Jan 6 at 5:07
|
show 1 more comment
$begingroup$
We have,
$$x^{2a}=frac{x}{a}$$
We see that $x=0$ is always a solution.
Now, if $aneqfrac{1}{2}$, then,
$$Longrightarrow x^{2a-1}=frac{1}{a}$$
$$Longrightarrow x=a^{frac{1}{1-2a}}$$
where both positive and negative solutions will come if $2a-1$ is even integer.
For $a=frac{1}{2}$, $x=0$ is the only solution.
Hope it is helpful:)
$endgroup$
$begingroup$
Sorry, I forgot to mention that x>0 and a>1.
$endgroup$
– James
Jan 6 at 5:06
$begingroup$
Ok then, ignore that for $a=frac{1}{2}$ and consider only positive solutions for $x$.
$endgroup$
– Martund
Jan 6 at 5:08
$begingroup$
How is the second to last step translated into the result?
$endgroup$
– James
Jan 6 at 5:10
$begingroup$
Take power $frac{1}{2a-1}$ on both sides, and apply $(m^p)^q=m^{pq}$ on both sides.
$endgroup$
– Martund
Jan 6 at 5:14
$begingroup$
So then on the side of x, the power of x would be 1?
$endgroup$
– James
Jan 6 at 5:15
|
show 1 more comment
$begingroup$
We have,
$$x^{2a}=frac{x}{a}$$
We see that $x=0$ is always a solution.
Now, if $aneqfrac{1}{2}$, then,
$$Longrightarrow x^{2a-1}=frac{1}{a}$$
$$Longrightarrow x=a^{frac{1}{1-2a}}$$
where both positive and negative solutions will come if $2a-1$ is even integer.
For $a=frac{1}{2}$, $x=0$ is the only solution.
Hope it is helpful:)
$endgroup$
$begingroup$
Sorry, I forgot to mention that x>0 and a>1.
$endgroup$
– James
Jan 6 at 5:06
$begingroup$
Ok then, ignore that for $a=frac{1}{2}$ and consider only positive solutions for $x$.
$endgroup$
– Martund
Jan 6 at 5:08
$begingroup$
How is the second to last step translated into the result?
$endgroup$
– James
Jan 6 at 5:10
$begingroup$
Take power $frac{1}{2a-1}$ on both sides, and apply $(m^p)^q=m^{pq}$ on both sides.
$endgroup$
– Martund
Jan 6 at 5:14
$begingroup$
So then on the side of x, the power of x would be 1?
$endgroup$
– James
Jan 6 at 5:15
|
show 1 more comment
$begingroup$
We have,
$$x^{2a}=frac{x}{a}$$
We see that $x=0$ is always a solution.
Now, if $aneqfrac{1}{2}$, then,
$$Longrightarrow x^{2a-1}=frac{1}{a}$$
$$Longrightarrow x=a^{frac{1}{1-2a}}$$
where both positive and negative solutions will come if $2a-1$ is even integer.
For $a=frac{1}{2}$, $x=0$ is the only solution.
Hope it is helpful:)
$endgroup$
We have,
$$x^{2a}=frac{x}{a}$$
We see that $x=0$ is always a solution.
Now, if $aneqfrac{1}{2}$, then,
$$Longrightarrow x^{2a-1}=frac{1}{a}$$
$$Longrightarrow x=a^{frac{1}{1-2a}}$$
where both positive and negative solutions will come if $2a-1$ is even integer.
For $a=frac{1}{2}$, $x=0$ is the only solution.
Hope it is helpful:)
answered Jan 6 at 5:04
MartundMartund
1,575212
1,575212
$begingroup$
Sorry, I forgot to mention that x>0 and a>1.
$endgroup$
– James
Jan 6 at 5:06
$begingroup$
Ok then, ignore that for $a=frac{1}{2}$ and consider only positive solutions for $x$.
$endgroup$
– Martund
Jan 6 at 5:08
$begingroup$
How is the second to last step translated into the result?
$endgroup$
– James
Jan 6 at 5:10
$begingroup$
Take power $frac{1}{2a-1}$ on both sides, and apply $(m^p)^q=m^{pq}$ on both sides.
$endgroup$
– Martund
Jan 6 at 5:14
$begingroup$
So then on the side of x, the power of x would be 1?
$endgroup$
– James
Jan 6 at 5:15
|
show 1 more comment
$begingroup$
Sorry, I forgot to mention that x>0 and a>1.
$endgroup$
– James
Jan 6 at 5:06
$begingroup$
Ok then, ignore that for $a=frac{1}{2}$ and consider only positive solutions for $x$.
$endgroup$
– Martund
Jan 6 at 5:08
$begingroup$
How is the second to last step translated into the result?
$endgroup$
– James
Jan 6 at 5:10
$begingroup$
Take power $frac{1}{2a-1}$ on both sides, and apply $(m^p)^q=m^{pq}$ on both sides.
$endgroup$
– Martund
Jan 6 at 5:14
$begingroup$
So then on the side of x, the power of x would be 1?
$endgroup$
– James
Jan 6 at 5:15
$begingroup$
Sorry, I forgot to mention that x>0 and a>1.
$endgroup$
– James
Jan 6 at 5:06
$begingroup$
Sorry, I forgot to mention that x>0 and a>1.
$endgroup$
– James
Jan 6 at 5:06
$begingroup$
Ok then, ignore that for $a=frac{1}{2}$ and consider only positive solutions for $x$.
$endgroup$
– Martund
Jan 6 at 5:08
$begingroup$
Ok then, ignore that for $a=frac{1}{2}$ and consider only positive solutions for $x$.
$endgroup$
– Martund
Jan 6 at 5:08
$begingroup$
How is the second to last step translated into the result?
$endgroup$
– James
Jan 6 at 5:10
$begingroup$
How is the second to last step translated into the result?
$endgroup$
– James
Jan 6 at 5:10
$begingroup$
Take power $frac{1}{2a-1}$ on both sides, and apply $(m^p)^q=m^{pq}$ on both sides.
$endgroup$
– Martund
Jan 6 at 5:14
$begingroup$
Take power $frac{1}{2a-1}$ on both sides, and apply $(m^p)^q=m^{pq}$ on both sides.
$endgroup$
– Martund
Jan 6 at 5:14
$begingroup$
So then on the side of x, the power of x would be 1?
$endgroup$
– James
Jan 6 at 5:15
$begingroup$
So then on the side of x, the power of x would be 1?
$endgroup$
– James
Jan 6 at 5:15
|
show 1 more comment
$begingroup$
This may be the way to proceed:
Hope this helps.
$endgroup$
add a comment |
$begingroup$
This may be the way to proceed:
Hope this helps.
$endgroup$
add a comment |
$begingroup$
This may be the way to proceed:
Hope this helps.
$endgroup$
This may be the way to proceed:
Hope this helps.
answered Jan 6 at 5:39
user629353user629353
1187
1187
add a comment |
add a comment |
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