Solve the equation using square roots. x^2 - 9 = 0

First, we need to get the X variable by itself. To do this, we need to add 9 to both sides.

X^2 - 9 = 0

X^2 - 9 + 9 = 0 + 9

X^2 = 9

Now, we need to take the square root of both sides.

√ (X^2) = √9

The square root of any squared number is the number itself. Thus:

√ (X^2) = + / - √9

X = + / - √9

X = + / - 3

Thus:

X = 3 and X = - 3