$\:\left(-3x+8\right)\left(-3x+4\right)$
$\lim_{x\to0}\left(\frac{4x}{\sqrt{4+x}-\sqrt{4-x}}\right)$
$a^4+2a^2+24$
$-4\cdot14$
$\left|1+\left(6-9\right)\right|-\left(8-12\right)$
$\frac{81-x^2}{9+x^2}$
$3x+1<5x-4$
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