- #1
p.mather
- 19
- 0
Homework Statement
∫ x * e^-x dx
Homework Equations
Integration by parts: Just wondering if below is correct. Not brilliant with Integration by parts and not sure if my +ve and -ve signs are correct. Some help to say if i am correct or where i have gone wrong would be brilliant.
The Attempt at a Solution
= x * ((e^-x)/(-1)) -∫ ((e^-x)/(-1)) * 1 dx
= -x * e^-x + ∫ e^-x dx
= -x * e^-x + ((e^-x)/(-1)) +c
= -x * e^-x - e^-x +c