Answer
$2$
Work Step by Step
RECALL:
(i) $a^{\frac{1}{4}}=\sqrt[4]{a}$
(ii) $\sqrt[4]{a^4}=|a|$
Use rule (i) above to obtain:
$=\sqrt[4]{16}$
Write 16 as $2^4$:
$=\sqrt[4]{2^4}$
Use rule (ii) above to obtain:
$=|2|
\\=2$