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Simplifying
-9x2 + 40 = -84
Reorder the terms:
40 + -9x2 = -84
Solving
40 + -9x2 = -84
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-40' to each side of the equation.
40 + -40 + -9x2 = -84 + -40
Combine like terms: 40 + -40 = 0
0 + -9x2 = -84 + -40
-9x2 = -84 + -40
Combine like terms: -84 + -40 = -124
-9x2 = -124
Divide each side by '-9'.
x2 = 13.77777778
Simplifying
x2 = 13.77777778
Take the square root of each side:
x = {-3.711842909, 3.711842909}
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