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Simplifying
9(9 + -9x2) = 9
(9 * 9 + -9x2 * 9) = 9
(81 + -81x2) = 9
Solving
81 + -81x2 = 9
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 + -81x2 = 9 + -81
Combine like terms: 81 + -81 = 0
0 + -81x2 = 9 + -81
-81x2 = 9 + -81
Combine like terms: 9 + -81 = -72
-81x2 = -72
Divide each side by '-81'.
x2 = 0.8888888889
Simplifying
x2 = 0.8888888889
Take the square root of each side:
x = {-0.942809042, 0.942809042}
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