$\lim_{x\to3}\:\:\:x^2+2x-15$
$\left(-3\right)-\left[\left(-9\right)-\left(-7\right)\right]$
$x^2+10x-1\:para\:x=-2$
$6^2+6^3+6^5$
$-4x-10+6x+7$
$\left(a^{-3}+a\right)\left(a^{-3}+7a\right)$
$16-\left(-25-3\right)$
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