Science:Math Exam Resources/Courses/MATH103/April 2012/Question 01 (e)/Statement

Answer the following multiple choice question. Check your answer very carefully. Your answer will be marked right or wrong (work will not be considered for this problem).

The value of the integral

$\int _{0}^{\infty }x^{2}e^{-x}\,dx$

is

A. $e-1$

B. $2e-1$

C. $0.5e$

D. $1$

E. $2$