$4\::\:-2\:=\:$
$1x^2-14x-15$
$4a^2-10a-25$
$\frac{x}{3}-\frac{1}{2}x\cdot\left(\frac{x}{3}+\frac{1}{2}\right)$
$f\left(x\right)=\left(6x^3+2\right)\left(x^2-\sqrt{x}\right)$
$18^2-23x-5$
$\left(3\left(\infty\right)^2-5\left(\infty\right)+2\right)$
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