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Question

By using the properties of definite integrals, evaluate the integral 82|x5|dx

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Solution

Let I=82|x5|dx
It can be seen that (x5)0 on [2,5] and (x5)0 on [5,8].
I=52(x5)dx+81(x5)dx
=[x225x]52+[x225x]82
=[252252+10]+[3240252+25]
=9

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