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![Domain:\ r\geq0\\\\a^{\frac{1}{n}}=\sqrt[n]{a}\\\\\text{Therefore}\ r^{\frac{1}{2}}=\sqrt[2]{r}=\sqrt{r}.\\\\r^{\frac{1}{2}}=7\\\\\sqrt{r}=7\qquad\text{square both sides}\\\\\left(\sqrt{r}\right)^2=7^2\qquad\text{use}\ (\sqrt{a})^2=a\\\\\boxed{r=49}](/tpl/images/0007/1645/2a1dd.png)
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