Wednesday

August 27, 2014

August 27, 2014

Posted by **Me** on Saturday, April 21, 2007 at 10:05pm.

There is a trick to this one that grealy simplifies the integral.

Let u = x^3 + 2x. Then

du = (3x^2 + 2)dx

The integral then bemoces just the integral of du/u, which is

ln u = ln (x^3 + 2x)

The limits of integration are from 1 to 3, so the answer is

ln (27 + 6) - ln (1+2) = ln 33/3 = ln 11

THANK YOU SOOOOOOOOOOOO MUCH!!! I actually understand that. Thanks!

**Related Questions**

Calculus II - Integrate using integration by parts (integral) (5-x) e^3x u = 5-x...

calc asap! - can you help me get started on this integral by parts? 4 S sqrt(t) ...

Calc - Hello im trying to integrate tan^3 dx i have solved out the whole thing ...

Calc - Hello im trying to integrate tan^3 dx i have solved out the whole thing ...

calc - find integral using table of integrals ) integral sin^4xdx this the ...

Calc BC - 1. Find the indefinite integral. Indefinite integral tan^3(pix/7)sec^2...

math - Evaluate the following indefinite integral by using the given ...

math - Evaluate the following indefinite integral by using the given ...

Calculus II/III - A. Find the integral of the following function. Integral of (x...

calculus - We're doing indefinite integrals using the substitution rule right ...