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Simplifying
x2 + -18x2 + 9 = 0
Reorder the terms:
9 + x2 + -18x2 = 0
Combine like terms: x2 + -18x2 = -17x2
9 + -17x2 = 0
Solving
9 + -17x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-9' to each side of the equation.
9 + -9 + -17x2 = 0 + -9
Combine like terms: 9 + -9 = 0
0 + -17x2 = 0 + -9
-17x2 = 0 + -9
Combine like terms: 0 + -9 = -9
-17x2 = -9
Divide each side by '-17'.
x2 = 0.5294117647
Simplifying
x2 = 0.5294117647
Take the square root of each side:
x = {-0.727606875, 0.727606875}
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