$4a^3+8a^2$
$\frac{x^5-x^4+x^2-2}{x^2+6}$
$\int\frac{7x}{e^{\left(x+5\right)}}dx$
$\left(x+3\right)^2+5\left(x-5\right)^2$
$-30+-40$
$x^3\left(1-x^4\right)$
$\lim_{x\to\infty}\left(\frac{4x^3-7}{x^4-1}\right)$
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