$\left(7+5x\right)\left(49-3x+25x^2\right)$
$\lim_{x\to07}\left(\frac{x-7}{\sqrt{x}-\sqrt{14-x}}\right)$
$x^2-7x+3.5$
$4x^2+4x-35$
$\int\:\left(4x+2\right)\sqrt{x^2+x+1}dx$
$\frac{14x^2\:+22x-12}{7x\:-3}$
$16y^2+24y+9$
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