$8\sqrt{5}-7\sqrt{5}-6\sqrt{5}+12\sqrt{5}+21\sqrt{5}$
$y''+2y'+2y=0$
$2\left(x+5\right)\left(x+2\right)$
$\left(5+6b\right)^2\cdot\left(5+6b\right)^3$
$\ln\sqrt{x^2}+1$
$\frac{3x^3}{1-x}$
$3a^2b^6\cdot7ab^4$
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