$\left(2x+7\right)\left(2x\right)$
$x\left(4\right)+3x\left(2\right)+4$
$\left(5\right)+\left(-7\right)\cdot\left(-3\right)+\left(-2\right)\cdot\left(-5\right)$
$x^7+7x^6\cdot y$
$\lim_{x\to\infty}\left(1+\frac{y}{x}\right)^x-1$
$25x^2-36y^2$
$4x^2+2xy+\frac{y^2}{4}$
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