The power of a product is equal to the product of it's factors raised to the same power
Simplify $\sqrt{a^4}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $4$ and $n$ equals $\frac{1}{2}$
Multiply the fraction and term in $4\cdot \left(\frac{1}{2}\right)$
Divide $4$ by $2$
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