SOLUTION: Find an antiderivative for −7 ( −6 x−5 )^(1/8)

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Question 971772: Find an antiderivative for −7 ( −6 x−5 )^(1/8)

Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
Find an antiderivative for -7%28-6x-5%5E%22%22%29%5E%281%2F8%29
Let an antiderivative be = k%2Au%5En

the derivative of k%2Au%5En is k%2An%2Au%5E%28n-1%29expr%28%28du%29%2F%28dx%29%29

Therefore k%2An%2Au%5E%28n-1%29expr%28%28du%29%2F%28dx%29%29%22%22=%22%22-7%28-6x-5%5E%22%22%29%5E%281%2F8%29

Set the bases equal to each other and the exponents equal to each other

u=%28-6x-5%5E%22%22%29 and n-1=1%2F8

Take the derivative; solve for n

%28du%29%2F%28dx%29=-6 and n=1%2B1%2F8=9%2F8

Substituting,

k%2Aexpr%289%2F8%29%2A%28-6x-5%5E%22%22%29%5E%281%2F8%29%2A%28-6%29%22%22=%22%22-7%28-6x-5%5E%22%22%29%5E%281%2F8%29

Multiply both sides by 8 to clear the fraction:

 k%2A9%2A%28-6x-5%5E%22%22%29%5E%281%2F8%29%2A%28-6%29%22%22=%22%22-56%28-6x-5%5E%22%22%29%5E%281%2F8%29

-54%2Ak%2A%28-6x-5%5E%22%22%29%5E%281%2F8%29%22%22=%22%22-56%28-6x-5%5E%22%22%29%5E%281%2F8%29

Divide both sides by %28-6x-5%5E%22%22%29%5E%281%2F8%29

-54%2Ak%22%22=%22%22-56

k%22%22=%22%22%28-56%29%2F%28-54%29

k%22%22=%22%2228%2F27

So an antiderivative = k%2Au%5En%22%22=%22%22expr%2828%2F27%29%28-6x-5%5E%22%22%29%5E%289%2F8%29

Edwin