$$4\sqrt{3}x^{2}+5x-2\sqrt{300}$$
$4\sqrt{3}x^{2}+5x-20\sqrt{3}$
$$4\sqrt{3}x^{2}+5x-2\times 10\sqrt{3}$$
$$4\sqrt{3}x^{2}+5x-20\sqrt{3}$$
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$8\sqrt{3}x+5$