$\left(-7\right)\left(-4\right)\left(2\right)$
$\lim_{x\to\infty}\left(15-16^{x^{-3}}\right)$
$\left(\frac{1}{2}m+n\right)\left(\frac{1}{2}m-2n\right)$
$2x^2-8x+3=0$
$13\cdot13$
$3x^4-8x^3+13x^2-12x+4$
$5-2x\:\:si\:x=2$
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