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Simplifying
15 + -3x * 3x = 0
Reorder the terms for easier multiplication:
15 + -3 * 3x * x = 0
Multiply -3 * 3
15 + -9x * x = 0
Multiply x * x
15 + -9x2 = 0
Solving
15 + -9x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-15' to each side of the equation.
15 + -15 + -9x2 = 0 + -15
Combine like terms: 15 + -15 = 0
0 + -9x2 = 0 + -15
-9x2 = 0 + -15
Combine like terms: 0 + -15 = -15
-9x2 = -15
Divide each side by '-9'.
x2 = 1.666666667
Simplifying
x2 = 1.666666667
Take the square root of each side:
x = {-1.290994449, 1.290994449}
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