Answer
-26.246
Work Step by Step
$-78^{\frac{3}{4}}=-(\sqrt[4] (78^{3})=-26.246$
This makes sense that $-(\sqrt[4] (78^{3}))=-(26.246)=-26.246$, as $-(\sqrt[4] (81^{3}))=-(27)=-27$. In this case, we are finding the opposite of $\sqrt[4] (78^{3})$.
