$2x^2-8x-3x+52$
$a=\left(x+1\right)\left(x+3\right)\left(x+2\right)\left(x+4\right)-\left(x^2+5x+5\right)^2$
$x^2+4x+4x$
$4m\left(2m^2+m+3\right)$
$\lim_{x\to-\infty}\sqrt{x^2+x-2}-\pi x$
$\left(5x^2+6\right)\left(5x^2-8\right)$
$30x^4\cdot7^{3x^2}^{+8}$
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