Question

Evaluate the integral by making the given substitution.http://www.webassign.net/cgi-bin/symimage.cgi?expr=int%20e%2A%2A%28-2%20x%29%20text%28%20%29%20dx%2C%20text%28%20%29%20u%20%3D%20-2%20x

Answer 1

\[\int\limits e^u du= e^u\]
Substitute back in

Answer 2

du=-2 dx
so you will have -1/2 in front of integral

Answer 3

keep in mind that if
u=-2x
then: du=-2dx or dx=-1/2 du

Answer 4

ok thanks guys : )