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Simplifying
(9 + -2x)(9 + 2x) = 0
Multiply (9 + -2x) * (9 + 2x)
(9(9 + 2x) + -2x * (9 + 2x)) = 0
((9 * 9 + 2x * 9) + -2x * (9 + 2x)) = 0
((81 + 18x) + -2x * (9 + 2x)) = 0
(81 + 18x + (9 * -2x + 2x * -2x)) = 0
(81 + 18x + (-18x + -4x2)) = 0
Combine like terms: 18x + -18x = 0
(81 + 0 + -4x2) = 0
(81 + -4x2) = 0
Solving
81 + -4x2 = 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 + -4x2 = 0 + -81
Combine like terms: 81 + -81 = 0
0 + -4x2 = 0 + -81
-4x2 = 0 + -81
Combine like terms: 0 + -81 = -81
-4x2 = -81
Divide each side by '-4'.
x2 = 20.25
Simplifying
x2 = 20.25
Take the square root of each side:
x = {-4.5, 4.5}
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