Question

What is x in, x^2=28 when x is a real number?

Answer 1

The two possible values are `2sqrt7` and `-2sqrt7`. See below

Explanation:

From `x^2=28`. Estracting square root in both sides, we have

`sqrt(x^2)=x=+-sqrt28=+-sqrt(4·7)=+-sqrt4·sqrt7=+-2sqrt7`