Question

enter the correct answer.
solve.
√81

Explanation:

Step1: Recall square root definition

The square root of a number \( x \), denoted \( \sqrt{x} \), is a value \( y \) such that \( y^2 = x \).

Step2: Find \( y \) for \( x = 81 \)

We need to find \( y \) where \( y^2 = 81 \). We know that \( 9 \times 9 = 81 \) (or \( 9^2 = 81 \)) and also \( (-9)^2 = 81 \), but the principal square root (the non - negative one, which is what is usually meant when we see \( \sqrt{81} \) without a negative sign in front) is \( 9 \).

Answer:

9