$\:\sqrt{\left(a+b\right)^2+\left(a+2b\right)^2-2a^2-6ab-5b^2}$
$7x+2=4x+23$
$-\frac{90}{1-4n}+5=11$
$a^2+12a+36$
$s^3+8s^2+19s+12$
$\sqrt[3]{8b^3}$
$\lim_{x\to2}\left(\frac{9x^2-4}{x}\right)$
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