Question

Solve –5√ x = –15.



A. x = –7
B. x = –9
C. x = 7
D. x = 9

Answer 1

-5√x = -15
-5 -5
√x = 3
x = 9

The answer is D.

Answer 2

Option (d) is correct.

`x=9`

Explanation:

Given : expression
`-5√(x)=-15`

We have to solve for x.

Consider the given expression
`-5√(x)=-15`

Divide both side by -5, we have,

`√(x)=(-15)/(-5)`

Simplify, we have,

`√(x)=3`

Squaring both side, we get,

`(√(x))^2=3^2`

Simplify, we get,

`x=9`

Thus, Option (d) is correct.