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Simplifying
(9 + -7x)(9 + 7x) = 0
Multiply (9 + -7x) * (9 + 7x)
(9(9 + 7x) + -7x * (9 + 7x)) = 0
((9 * 9 + 7x * 9) + -7x * (9 + 7x)) = 0
((81 + 63x) + -7x * (9 + 7x)) = 0
(81 + 63x + (9 * -7x + 7x * -7x)) = 0
(81 + 63x + (-63x + -49x2)) = 0
Combine like terms: 63x + -63x = 0
(81 + 0 + -49x2) = 0
(81 + -49x2) = 0
Solving
81 + -49x2 = 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 + -49x2 = 0 + -81
Combine like terms: 81 + -81 = 0
0 + -49x2 = 0 + -81
-49x2 = 0 + -81
Combine like terms: 0 + -81 = -81
-49x2 = -81
Divide each side by '-49'.
x2 = 1.653061224
Simplifying
x2 = 1.653061224
Take the square root of each side:
x = {-1.285714286, 1.285714286}
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