Question

what is $pmsqrt{400}$? or

Explanation:

Step1: Recall square - root definition

The square - root of a number \(x\) is a value \(y\) such that \(y^2=x\). We need to find \(y\) where \(y^2 = 400\).

Step2: Find the square - root values

We know that \(20\times20 = 400\) and \((- 20)\times(-20)=400\). So \(\pm\sqrt{400}=\pm20\).

Answer:

20 or - 20