$-7x^2+14x+49$

$\left(-7\right)x\:\left(-2\right)x\:\left(2\right)$

$\left(8p-14q\right)\left(8p+14q\right)$

$\frac{dy}{dx}\left(e^y\cos\left(x\right)=1+\sin\left(xy\right)\right)$

$x\:^2-2y\:^3+3xy-4y^3-x^2$

$\left(-5x+33\right)^2$

$\left(\frac{x-2}{5}\right)+\frac{x}{4}=5$