$x4-20x^2+100$
$y4\:-\:25$
$-2x\left(2x+3\right)+3x\left(3x+2\right);\:x=-1$
$\frac{3x^{2}-5x}{2x^{2}+1}$
$\lim_{x\to\infty}\left(\frac{3x+\cos\left(x\right)}{3x+sin\left(x\right)+2}\right)$
$\left(3y+4z\right)^2$
$9+42x+49x^2$
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