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Simplifying
(x + -0.4)(x + 0.4) = 0
Reorder the terms:
(-0.4 + x)(x + 0.4) = 0
Reorder the terms:
(-0.4 + x)(0.4 + x) = 0
Multiply (-0.4 + x) * (0.4 + x)
(-0.4(0.4 + x) + x(0.4 + x)) = 0
((0.4 * -0.4 + x * -0.4) + x(0.4 + x)) = 0
((-0.16 + -0.4x) + x(0.4 + x)) = 0
(-0.16 + -0.4x + (0.4 * x + x * x)) = 0
(-0.16 + -0.4x + (0.4x + x2)) = 0
Combine like terms: -0.4x + 0.4x = 0.0
(-0.16 + 0.0 + x2) = 0
(-0.16 + x2) = 0
Solving
-0.16 + x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '0.16' to each side of the equation.
-0.16 + 0.16 + x2 = 0 + 0.16
Combine like terms: -0.16 + 0.16 = 0.00
0.00 + x2 = 0 + 0.16
x2 = 0 + 0.16
Combine like terms: 0 + 0.16 = 0.16
x2 = 0.16
Simplifying
x2 = 0.16
Take the square root of each side:
x = {-0.4, 0.4}
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