Question

Which choice is equivalent to the expression below √-81​

Answer 1

Answer:

E

Step-by-step explanation:

$\sqrt{-81}$ is the same as $\sqrt{81}$ · $\sqrt{-1}$

This can be simplified to 9 · $\sqrt{-1}$

And the square root of -1 is i,

so this equals 9i

Answer 2

$\sqrt{- 81}$ is equivalent to 9i.

What is the square root?

Square root of a number is the number by which if we multiply the same number, then we will get the first number.

Given, $\sqrt{- 81}$ = ± 9i

A. -$\sqrt{9}$ = ∓ 3

B. i $\sqrt{9}$ = ± 3i

C. $\sqrt{9i}$ = ± $3 \sqrt{i}$

D. -9 = - 9

E. 9i = 9i

Therefore, option E is correct.

Lear more about square root here: https://brainly.com/question/14465888

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