Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Evaluate the improper integral
∫
0
∞
x
e
−
x
d
x
\displaystyle \int_{0}^{\infty} x e^{-x}\,dx
∫
0
∞
x
e
−
x
d
x
and state its exact value.
Browse the problem library