$-3.\sqrt[2]{242}$
$\lim_{x\to-\infty}\left(\sqrt{16x^2-5x}-2\sqrt{4x^2+1}\right)$
$4x^2+23x+33=2x+8$
$7x\ge x+30$
$\lim_{x\to\frac{2}{5}}\left(\frac{2x^2+3x-20}{2x^2-x-10}\right)$
$3\left(-5\right)^2-33\left(-5\right)+90$
$4 x ^ { 3 } - x ^ { 2 } - 3$
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