Question

What are the 2 square roots of 81 one is 9 what is the other?

Answer 1

The answer is:

9, -9

Work/explanation:

When we take the square root of a number, we get solutions that are opposites of each other. In other words, the square roots of a² are a and -a.

Similarly, the square roots of 81 are 9 and -9.

Hence, these are the answers.

Answer 2

18

Explanation:

√81 = √(9 × 9)

√81 = √(9)2

Now, remove square and square root, we get

√81 = ± 9