9x^2-9=72

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Solution for 9x^2-9=72 equation: 


Simplifying
9x2 + -9 = 72

Reorder the terms:
-9 + 9x2 = 72

Solving
-9 + 9x2 = 72

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 + 9x2 = 72 + 9

Combine like terms: -9 + 9 = 0
0 + 9x2 = 72 + 9
9x2 = 72 + 9

Combine like terms: 72 + 9 = 81
9x2 = 81

Divide each side by '9'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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