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Simplifying
(7 + -5x)(7 + 5x) = 0
Multiply (7 + -5x) * (7 + 5x)
(7(7 + 5x) + -5x * (7 + 5x)) = 0
((7 * 7 + 5x * 7) + -5x * (7 + 5x)) = 0
((49 + 35x) + -5x * (7 + 5x)) = 0
(49 + 35x + (7 * -5x + 5x * -5x)) = 0
(49 + 35x + (-35x + -25x2)) = 0
Combine like terms: 35x + -35x = 0
(49 + 0 + -25x2) = 0
(49 + -25x2) = 0
Solving
49 + -25x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-49' to each side of the equation.
49 + -49 + -25x2 = 0 + -49
Combine like terms: 49 + -49 = 0
0 + -25x2 = 0 + -49
-25x2 = 0 + -49
Combine like terms: 0 + -49 = -49
-25x2 = -49
Divide each side by '-25'.
x2 = 1.96
Simplifying
x2 = 1.96
Take the square root of each side:
x = {-1.4, 1.4}
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