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Simplifying
(4 + -5x)(4 + 5x) = 0
Multiply (4 + -5x) * (4 + 5x)
(4(4 + 5x) + -5x * (4 + 5x)) = 0
((4 * 4 + 5x * 4) + -5x * (4 + 5x)) = 0
((16 + 20x) + -5x * (4 + 5x)) = 0
(16 + 20x + (4 * -5x + 5x * -5x)) = 0
(16 + 20x + (-20x + -25x2)) = 0
Combine like terms: 20x + -20x = 0
(16 + 0 + -25x2) = 0
(16 + -25x2) = 0
Solving
16 + -25x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-16' to each side of the equation.
16 + -16 + -25x2 = 0 + -16
Combine like terms: 16 + -16 = 0
0 + -25x2 = 0 + -16
-25x2 = 0 + -16
Combine like terms: 0 + -16 = -16
-25x2 = -16
Divide each side by '-25'.
x2 = 0.64
Simplifying
x2 = 0.64
Take the square root of each side:
x = {-0.8, 0.8}
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