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# integration watch

1. if i integrate 36/(2x+1)^4 ,

i do: 36(1/(2x+1)^4 /2
= 18 ln(2x+1)4 + c. is this right?
2. (Original post by elvss567)
if i integrate 36/(2x+1)^4 ,

i do: 36(1/(2x+1)^4 /2
= 18 ln(2x+1)4 + c. is this right?
It's not a case of natural logs because the denominator has a power of 4 and not 1 i.e. becomes a natural log because the denominator is

The question is a simple case of integration actually,
3. you can change the variable:

let u = 2x + 1

du/dx = 2

dx = du/2

∫ 36u-4/2 du

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