- #1
jaidon
- 42
- 0
this should be easy, but I'm struggling. I'm trying to help a friend solve:
integral(5x^3(1+x^2)^1/2), sorry i don't know how to do the integral sign.
i did a u sub with u=1+x^2, du=2xdx
and u-1=x^2
so:
(5/2)integral((u-1)(u)^1/2)
i get (1+x^2)^5/2-10/6(1+x^2)^3/2 +C
the answer says it should be 15/8(1+x^2)^4/3+C
i'm not sure what i have done wrong.
integral(5x^3(1+x^2)^1/2), sorry i don't know how to do the integral sign.
i did a u sub with u=1+x^2, du=2xdx
and u-1=x^2
so:
(5/2)integral((u-1)(u)^1/2)
i get (1+x^2)^5/2-10/6(1+x^2)^3/2 +C
the answer says it should be 15/8(1+x^2)^4/3+C
i'm not sure what i have done wrong.