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Simplifying
3x2 + -39 = 9
Reorder the terms:
-39 + 3x2 = 9
Solving
-39 + 3x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '39' to each side of the equation.
-39 + 39 + 3x2 = 9 + 39
Combine like terms: -39 + 39 = 0
0 + 3x2 = 9 + 39
3x2 = 9 + 39
Combine like terms: 9 + 39 = 48
3x2 = 48
Divide each side by '3'.
x2 = 16
Simplifying
x2 = 16
Take the square root of each side:
x = {-4, 4}
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