Answer
$\frac{3a^{2}}{2}$
Work Step by Step
Using equation (2), we have
$\int^{2a}_{a}xdx= \frac{(2a)^{2}}{2}-\frac{a^{2}}{2}$
$=\frac{4a^{2}}{2}-\frac{a^{2}}{2}= \frac{3a^{2}}{2}$
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