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## Homework Statement

Integral a^2 f(x) dx .....limits are 0 to a

I know the answer is... 1/2 Integral (a-x)^2 f(x) dx

## Homework Equations

## The Attempt at a Solution

I do not know how to approach this problem. I have tried to use the fundamental theorem of calculus its not working. This is a review for a test. Thanks in advance.