Question

For any nonnegative real number.

Answer 1

Answer:

A

Step-by-step explanation:

We know that $\sqrt{b}=b^{1/2}$.

We also know that $(a^b)^c=a^{bc}$.

We can combine these facts to get $(\sqrt{b})^2=(b^{1/2})^2=b^{1/2*2}=b^{1}=b$.

So, the answer is $\boxed{A}$ and we're done!

Note: the non-negative part or the equation comes from the fact that you assume the square root of a negative number doesn't exist. You will change this assumption later in the year, or in further years.