Posted by 009 on Wednesday, February 27, 2013 at 8:24am.
Evaluate the integral of abs(x) from 4 to 4.

Calc  Steve, Wednesday, February 27, 2013 at 11:53am
graph f(x). It is just two triangles of base 4, height 4. No integration required.
If you do insist on integrating, recognize that f(x) is a piecewise function, and must be divided at x=0.
f(x) = x for x<0
f(x) = x for x>=0
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