(x-2)(x+2)=(x-1)

Solution for (x-2)(x+2)=(x-1) equation:

Simplifying
(x + -2)(x + 2) = (x + -1)

Reorder the terms:
(-2 + x)(x + 2) = (x + -1)

Reorder the terms:
(-2 + x)(2 + x) = (x + -1)

Multiply (-2 + x) * (2 + x)
(-2(2 + x) + x(2 + x)) = (x + -1)
((2 * -2 + x * -2) + x(2 + x)) = (x + -1)
((-4 + -2x) + x(2 + x)) = (x + -1)
(-4 + -2x + (2 * x + x * x)) = (x + -1)
(-4 + -2x + (2x + x2)) = (x + -1)

Combine like terms: -2x + 2x = 0
(-4 + 0 + x2) = (x + -1)
(-4 + x2) = (x + -1)

Reorder the terms:
-4 + x2 = (-1 + x)

Remove parenthesis around (-1 + x)
-4 + x2 = -1 + x

Solving
-4 + x2 = -1 + x

Solving for variable 'x'.

Reorder the terms:
-4 + 1 + -1x + x2 = -1 + x + 1 + -1x

Combine like terms: -4 + 1 = -3
-3 + -1x + x2 = -1 + x + 1 + -1x

Reorder the terms:
-3 + -1x + x2 = -1 + 1 + x + -1x

Combine like terms: -1 + 1 = 0
-3 + -1x + x2 = 0 + x + -1x
-3 + -1x + x2 = x + -1x

Combine like terms: x + -1x = 0
-3 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -1x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -1x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1x + x2 = 0 + 3
-1x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-1x + x2 = 3

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 3 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 3 + 0.25

Combine like terms: 3 + 0.25 = 3.25
0.25 + -1x + x2 = 3.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(x + -0.5) equal to 1.802775638 and -1.802775638.

Subproblem 1
x + -0.5 = 1.802775638

Simplifying
x + -0.5 = 1.802775638

Reorder the terms:
-0.5 + x = 1.802775638

Solving
-0.5 + x = 1.802775638

Solving for variable 'x'.

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

Add '0.5' to each side of the equation.
-0.5 + 0.5 + x = 1.802775638 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x = 1.802775638 + 0.5
x = 1.802775638 + 0.5

Combine like terms: 1.802775638 + 0.5 = 2.302775638
x = 2.302775638

Simplifying
x = 2.302775638

Subproblem 2
x + -0.5 = -1.802775638

Simplifying
x + -0.5 = -1.802775638

Reorder the terms:
-0.5 + x = -1.802775638

Solving
-0.5 + x = -1.802775638

Solving for variable 'x'.

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

Add '0.5' to each side of the equation.
-0.5 + 0.5 + x = -1.802775638 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x = -1.802775638 + 0.5
x = -1.802775638 + 0.5

Combine like terms: -1.802775638 + 0.5 = -1.302775638
x = -1.302775638

Simplifying
x = -1.302775638

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {2.302775638, -1.302775638}