$2b\left(b^2+3a^2\right)$
$\lim_{x\to0}\left(\frac{\sqrt{a+x}-\sqrt{x}}{a}\right)$
$-9x^7-18x^4-27x^3$
$f\left(0\right)=\left(3-20\right)^3$
$x^2\:-\:12x\:+20$
$\left(3n\cdot4n^3\right)^2$
$f\left(x\right)=\left(2x^2+1\right)^3\left(3x-2\right)^2$
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