$x^2+8x+12<0$
$-4k^2-k+-5k+3k^2+-3k^2$
$-xy-8xy-19xy+40xy$
$\frac{d}{dx}\left(ln\left(\frac{\left(4x+1\right)^2}{\sqrt{\left(x^2+1\right)}}\right)\right)$
$5x^2+5y^2+10x-5y+3=0$
$\left(-15\right).2-\left(-16\right)\left(-8\right)$
$12^2b+5^2n$
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