what is the negative square root of 16?

Explanation:

Step1: Recall square - root concept

The square - root of a number $x$ is a value $y$ such that $y^2=x$. The symbol for the square - root is $\sqrt{x}$. We want the negative square - root of 16.

Step2: Calculate square - root of 16

We know that $4^2 = 16$ and $(-4)^2=16$. The square - roots of 16 are $\pm4$.

Step3: Select the negative square - root

The negative square - root of 16 is $- 4$.

Answer:

$-4$