9x^2-1=80

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Solution for 9x^2-1=80 equation: 


Simplifying
9x2 + -1 = 80

Reorder the terms:
-1 + 9x2 = 80

Solving
-1 + 9x2 = 80

Solving for variable 'x'.

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

Add '1' to each side of the equation.
-1 + 1 + 9x2 = 80 + 1

Combine like terms: -1 + 1 = 0
0 + 9x2 = 80 + 1
9x2 = 80 + 1

Combine like terms: 80 + 1 = 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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