$4z^2+24zw+36w^2$
$2x\left(5-x\right)$
$20,\:19\cdot20$
$-x^4-2x^2+x+3;\:x=2$
$4s^2-24s+37$
$\lim_{x\to\infty}\left(1+\frac{1}{2x}\right)^2$
$-35\:.\:5\::\:-1$
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