$x^2-50x+336$
$16x^2-48xy+36y^2$
$31^2-81^2$
$\left(-1\right)^n\left(\frac{n^2}{2n^3+1}\right)$
$12-4\cdot\left(-3\right)\cdot2+6$
$015^2$
$2h+j+3h+4j$
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