# use suitable substitution to integrate

• May 26th 2010, 12:21 AM
decoy808
use suitable substitution to integrate
would be much grateful for help with the following 2 problems.

use suitable substitution to integrate

(a) $f(x) = x^2 (x^2 - 10)^{20}$

(b) $f(t) = t^2 e^{3t^3+5}$
• May 26th 2010, 12:43 AM
pickslides
Quote:

Originally Posted by decoy808

(b) $f(t) = t^2 e^{3t^3+5}$

$u = 3t^3+5$
• May 26th 2010, 09:29 AM
General
Quote:

Originally Posted by decoy808
(a) $f(x) = x^2 (x^2 - 10)^{20}$

Try this : $u=x^2-10$