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Simplifying
-3x2 + 87 = 39
Reorder the terms:
87 + -3x2 = 39
Solving
87 + -3x2 = 39
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-87' to each side of the equation.
87 + -87 + -3x2 = 39 + -87
Combine like terms: 87 + -87 = 0
0 + -3x2 = 39 + -87
-3x2 = 39 + -87
Combine like terms: 39 + -87 = -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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