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Simplifying
3x2 + -115 = -7
Reorder the terms:
-115 + 3x2 = -7
Solving
-115 + 3x2 = -7
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '115' to each side of the equation.
-115 + 115 + 3x2 = -7 + 115
Combine like terms: -115 + 115 = 0
0 + 3x2 = -7 + 115
3x2 = -7 + 115
Combine like terms: -7 + 115 = 108
3x2 = 108
Divide each side by '3'.
x2 = 36
Simplifying
x2 = 36
Take the square root of each side:
x = {-6, 6}
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