Question

Which choice correctly shows the solution(s) of the equation x2=121?

Answer 1

x=±11

Explanation:

To solve, we need to isolate the variable x,

To do this, take the square root of both sides

`x^(2) =121\\\sqrt{x^(2) } =√(121)`

x=±11

It is positive or negative 11 because 11^2 (11*11)=121, but -11^2 (-11*-11) also equals 121 because 2 negatives multiplied become a positive.

Answer 2

x = ±11

Explanation:

x^2 =121

Take the square root of each side

sqrt(x^2) = ±sqrt(121)

x = ±11