$\frac{x}{\sqrt{x^2-x}}$
$x-7^2+7\left(x-7\right)+6$
$-2x^4+4x^3+6x^2-8x+8$
$x^4-x^2+\frac{9}{x}+2$
$-\left(a-b\right)^2+\left(a+b\right)^2-3ab$
$\frac{4^{-1}}{4^{-2}}$
$\left(b+4\right)\left(2b+7\right)$
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