# (3sqrt{-{frac{1}{8}}}^3+3(frac{3}{4})

$\left(3{\sqrt{-\left\{\frac{1}{8}\right\}}}^{3}+3\left(\frac{3}{4}\right)$
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aprovard

cubic root of a number to the power of 3 equal the same number
thus
cubic root of
$3\phantom{\rule{1em}{0ex}}\text{and}\phantom{\rule{1em}{0ex}}\frac{3}{4}=\frac{15}{4}$
thus

$\frac{29}{8}\phantom{\rule{1em}{0ex}}\text{or}\phantom{\rule{1em}{0ex}}3.6$