$25x^4+30x^2+9$
$22-8x-15x^2+\frac{6x^3}{2x-7}$
$\lim_{x\to0}\left(\frac{3x^2-4x^3}{5x+7x^3}\right)$
$\left(-8x+4\right)^2$
$\left(2x^2-3\right)\left(2x^2+8\right)$
$\int_8^{\infty}\left(\frac{1}{\left(x^2-6x\right)^{\frac{3}{2}}}\right)dx$
$6x-15$
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