Question

Can someone walk me through the steps to solve this integral?

Answer 1

\[\int\limits_{}^{} e ^{-x/2}\]

Answer 2

Im told its -2e^(-x/2) . Wheres the -2 coming from? I think it should be e^(-x/2) /4

Answer 3

it came from u-sub

Answer 4

k, so to get started... u=(-x/2) ?

Answer 5

good, what is du?

Answer 6

-1/2

Answer 7

well, du/dx = -1/2, but what is du?

Answer 8

ah, -1/2dx

Answer 9

good, what's dx?

Answer 10

heh, -2du :D

Answer 11

now you see why?

Answer 12

Yep. Think I get it. Thanks!

Answer 13

yw