Question

Integrals,

Can someone please explain to me this intergrating step ? thanks a lot http://screencast.com/t/le8PKXcw4g

Answer 1

@ hero

Answer 2

@Hero

Answer 3

the derivative of ln (ax+b) is a/(ax+b)
so, the integral of 1/(ax+b) will be ln (ax+b) /a
got this ?

Answer 4

So there is an actual identity that I need to know for this ?

Answer 5

you want a formula ?
\(\Large \int \dfrac{1}{ax+b}dx=\dfrac{\ln |ax+b|}{a}+c\)

Answer 6

i m sure u know integral of 1 is x, right ?

Answer 7

yes

Answer 8

so, tell me if you still don't get that step..