$\left(2k+5r\right)\left(2k-5r\right)=4k^2-25r^2$
$\int\frac{2x-1}{\left(x^2+1\right)^2}dx$
$-\frac{7}{8}a+a$
$3\left(3-1\right)+\left(-3\right)^2-5$
$3-4-4-4-6+21+7+8$
$-20^2$
$x\left(2x-1\right)\left(2x+5\right)$
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