3x^2-66=9

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Solution for 3x^2-66=9 equation: 


Simplifying
3x2 + -66 = 9

Reorder the terms:
-66 + 3x2 = 9

Solving
-66 + 3x2 = 9

Solving for variable 'x'.

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

Add '66' to each side of the equation.
-66 + 66 + 3x2 = 9 + 66

Combine like terms: -66 + 66 = 0
0 + 3x2 = 9 + 66
3x2 = 9 + 66

Combine like terms: 9 + 66 = 75
3x2 = 75

Divide each side by '3'.
x2 = 25

Simplifying
x2 = 25

Take the square root of each side:
x = {-5, 5}

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