How do you solve x squared -28?

Answer 1

There's nothing to solve. If it equaled something, you could solve it. For example, if x^2 - 28 = 0, then x = the square root of 28, which simplifies to plus or minus 2 times the square root of 7.

Answer 2

Youcannot solve an expression: you need an equation (or inequality) before it can be solved.