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Simplifying
(9 + -5x)(9 + 5x) = 0
Multiply (9 + -5x) * (9 + 5x)
(9(9 + 5x) + -5x * (9 + 5x)) = 0
((9 * 9 + 5x * 9) + -5x * (9 + 5x)) = 0
((81 + 45x) + -5x * (9 + 5x)) = 0
(81 + 45x + (9 * -5x + 5x * -5x)) = 0
(81 + 45x + (-45x + -25x2)) = 0
Combine like terms: 45x + -45x = 0
(81 + 0 + -25x2) = 0
(81 + -25x2) = 0
Solving
81 + -25x2 = 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 + -25x2 = 0 + -81
Combine like terms: 81 + -81 = 0
0 + -25x2 = 0 + -81
-25x2 = 0 + -81
Combine like terms: 0 + -81 = -81
-25x2 = -81
Divide each side by '-25'.
x2 = 3.24
Simplifying
x2 = 3.24
Take the square root of each side:
x = {-1.8, 1.8}
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