$100m^2n^2-169y^2$
$26-36x^4$
$\left(\frac{2x}{5}-\frac{1}{2}\right)^2$
$\left(-34\right)-\left(-71\right)$
$\left(2x-4\right)\left(-5x-8\right)$
$\lim_{x\to\infty}\left(\sqrt{3x-1}-\sqrt{x^2-2x}\right)$
$\left(1-p\right)dx=2\left(1+x\right)dp$
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