$x^2+x-30=0$
$\left(2.5x+3y\right)\left(2.5x-3y\right)$
$-x^2+4x-1$
$\frac{3x^2-11x-13}{3x+4}$
$\lim_{x\to\infty}\:\frac{x^2-3x+7}{x^3+10x-4}$
$x\left(2x-3\right)\left(3x+4\right)$
$-6x^2-7x^2$
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