x^2-9=9

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Solution for x^2-9=9 equation: 


Simplifying
x2 + -9 = 9

Reorder the terms:
-9 + x2 = 9

Solving
-9 + x2 = 9

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + x2 = 9 + 9

Combine like terms: -9 + 9 = 0
0 + x2 = 9 + 9
x2 = 9 + 9

Combine like terms: 9 + 9 = 18
x2 = 18

Simplifying
x2 = 18

Take the square root of each side:
x = {-4.242640687, 4.242640687}

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