Answer
$a]$ $\sqrt 3$
$b]$ $\sqrt[3] (x+1)^{2}$
Work Step by Step
$a]$ $\sqrt[4] (3)^{2}=$ $(3)^{2\times\frac{1}{4}}=$ $3^{\frac{1}{2}}=\sqrt 3$
$b]$ $\sqrt[6] (x+1)^{4}=$ $(x+1)^{\frac{4}{6}}=$ $\sqrt[3] (x+1)^{2}$
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