Question

Solve the equation using square roots.

x^2-9=0

Answer 1

x^2-9=0
x^2 = 9 add 9 to both sides and in the next step, take the square root of both sides:

x = \[\pm3\]

Answer 2

what does that plus - sign mean

Answer 3

it means you have two solutions to your equation... x = 3, x = -3