Double Integral Practice

Calculus Level 1

Compute the double integral

0 1 0 2 y e x d x d y . \int_0^1 \int_0^{\infty} 2ye^{-x} dx\, dy.


The answer is 1.

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1 solution

Matt DeCross
Apr 24, 2016

The integrals can be computed separately, and are each straightforward:

0 1 0 2 y e x d x d y = 0 1 2 y d y = 1. \int_0^1 \int_0^{\infty} 2ye^{-x} \, dx dy = \int_0^1 2y dy = 1.

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