(x-2)(x+6)-6=0

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Solution for (x-2)(x+6)-6=0 equation:


Simplifying
(x + -2)(x + 6) + -6 = 0

Reorder the terms:
(-2 + x)(x + 6) + -6 = 0

Reorder the terms:
(-2 + x)(6 + x) + -6 = 0

Multiply (-2 + x) * (6 + x)
(-2(6 + x) + x(6 + x)) + -6 = 0
((6 * -2 + x * -2) + x(6 + x)) + -6 = 0
((-12 + -2x) + x(6 + x)) + -6 = 0
(-12 + -2x + (6 * x + x * x)) + -6 = 0
(-12 + -2x + (6x + x2)) + -6 = 0

Combine like terms: -2x + 6x = 4x
(-12 + 4x + x2) + -6 = 0

Reorder the terms:
-12 + -6 + 4x + x2 = 0

Combine like terms: -12 + -6 = -18
-18 + 4x + x2 = 0

Solving
-18 + 4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 4x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + 4x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 4x + x2 = 0 + 18
4x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
4x + x2 = 18

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 18 + 4

Reorder the terms:
4 + 4x + x2 = 18 + 4

Combine like terms: 18 + 4 = 22
4 + 4x + x2 = 22

Factor a perfect square on the left side:
(x + 2)(x + 2) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(x + 2) equal to 4.69041576 and -4.69041576.

Subproblem 1

x + 2 = 4.69041576 Simplifying x + 2 = 4.69041576 Reorder the terms: 2 + x = 4.69041576 Solving 2 + x = 4.69041576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 4.69041576 + -2 Combine like terms: 2 + -2 = 0 0 + x = 4.69041576 + -2 x = 4.69041576 + -2 Combine like terms: 4.69041576 + -2 = 2.69041576 x = 2.69041576 Simplifying x = 2.69041576

Subproblem 2

x + 2 = -4.69041576 Simplifying x + 2 = -4.69041576 Reorder the terms: 2 + x = -4.69041576 Solving 2 + x = -4.69041576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -4.69041576 + -2 Combine like terms: 2 + -2 = 0 0 + x = -4.69041576 + -2 x = -4.69041576 + -2 Combine like terms: -4.69041576 + -2 = -6.69041576 x = -6.69041576 Simplifying x = -6.69041576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.69041576, -6.69041576}

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