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Simplifying
75 = 3x2 + -9
Reorder the terms:
75 = -9 + 3x2
Solving
75 = -9 + 3x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-3x2' to each side of the equation.
75 + -3x2 = -9 + 3x2 + -3x2
Combine like terms: 3x2 + -3x2 = 0
75 + -3x2 = -9 + 0
75 + -3x2 = -9
Add '-75' to each side of the equation.
75 + -75 + -3x2 = -9 + -75
Combine like terms: 75 + -75 = 0
0 + -3x2 = -9 + -75
-3x2 = -9 + -75
Combine like terms: -9 + -75 = -84
-3x2 = -84
Divide each side by '-3'.
x2 = 28
Simplifying
x2 = 28
Take the square root of each side:
x = {-5.291502622, 5.291502622}
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