Question

Which choice correctly shows the solution(s) of the equation x2 = 121?
A) x = √ 121
B) x = − √ 121
C) x = ± √ 11
D) x = ± √ 121

Answer 1

Hello from MrBillDoesMath!

Answer:

Choice D, x = +\ sqrt(121)

Discussion:

x^2 = 121           =>          take square roots of both sides

x = +\- sqrt(121) =>         as sqrt(121) = +\- 11

x = +\- 11                    

The closest answer is D as it includes both values of x,  unlike choices A and B which include a single value of the square root

Thank you,

MrB