(x-0.9)(x+0.9)=

Solution for (x-0.9)(x+0.9)= equation:

Simplifying
(x + -0.9)(x + 0.9) = 0

Reorder the terms:
(-0.9 + x)(x + 0.9) = 0

Reorder the terms:
(-0.9 + x)(0.9 + x) = 0

Multiply (-0.9 + x) * (0.9 + x)
(-0.9(0.9 + x) + x(0.9 + x)) = 0
((0.9 * -0.9 + x * -0.9) + x(0.9 + x)) = 0
((-0.81 + -0.9x) + x(0.9 + x)) = 0
(-0.81 + -0.9x + (0.9 * x + x * x)) = 0
(-0.81 + -0.9x + (0.9x + x2)) = 0

Combine like terms: -0.9x + 0.9x = 0.0
(-0.81 + 0.0 + x2) = 0
(-0.81 + x2) = 0

Solving
-0.81 + x2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.81' to each side of the equation.
-0.81 + 0.81 + x2 = 0 + 0.81

Combine like terms: -0.81 + 0.81 = 0.00
0.00 + x2 = 0 + 0.81
x2 = 0 + 0.81

Combine like terms: 0 + 0.81 = 0.81
x2 = 0.81

Simplifying
x2 = 0.81

Take the square root of each side:
x = {-0.9, 0.9}