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Simplifying
x2 + -18x2 + 81 = 0
Reorder the terms:
81 + x2 + -18x2 = 0
Combine like terms: x2 + -18x2 = -17x2
81 + -17x2 = 0
Solving
81 + -17x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-81' to each side of the equation.
81 + -81 + -17x2 = 0 + -81
Combine like terms: 81 + -81 = 0
0 + -17x2 = 0 + -81
-17x2 = 0 + -81
Combine like terms: 0 + -81 = -81
-17x2 = -81
Divide each side by '-17'.
x2 = 4.764705882
Simplifying
x2 = 4.764705882
Take the square root of each side:
x = {-2.182820625, 2.182820625}
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