(x+6)(x+6)-28=0

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Solution for (x+6)(x+6)-28=0 equation:


Simplifying
(x + 6)(x + 6) + -28 = 0

Reorder the terms:
(6 + x)(x + 6) + -28 = 0

Reorder the terms:
(6 + x)(6 + x) + -28 = 0

Multiply (6 + x) * (6 + x)
(6(6 + x) + x(6 + x)) + -28 = 0
((6 * 6 + x * 6) + x(6 + x)) + -28 = 0
((36 + 6x) + x(6 + x)) + -28 = 0
(36 + 6x + (6 * x + x * x)) + -28 = 0
(36 + 6x + (6x + x2)) + -28 = 0

Combine like terms: 6x + 6x = 12x
(36 + 12x + x2) + -28 = 0

Reorder the terms:
36 + -28 + 12x + x2 = 0

Combine like terms: 36 + -28 = 8
8 + 12x + x2 = 0

Solving
8 + 12x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + 12x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + 12x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 12x + x2 = 0 + -8
12x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
12x + x2 = -8

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = -8 + 36

Reorder the terms:
36 + 12x + x2 = -8 + 36

Combine like terms: -8 + 36 = 28
36 + 12x + x2 = 28

Factor a perfect square on the left side:
(x + 6)(x + 6) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(x + 6) equal to 5.291502622 and -5.291502622.

Subproblem 1

x + 6 = 5.291502622 Simplifying x + 6 = 5.291502622 Reorder the terms: 6 + x = 5.291502622 Solving 6 + x = 5.291502622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 5.291502622 + -6 Combine like terms: 6 + -6 = 0 0 + x = 5.291502622 + -6 x = 5.291502622 + -6 Combine like terms: 5.291502622 + -6 = -0.708497378 x = -0.708497378 Simplifying x = -0.708497378

Subproblem 2

x + 6 = -5.291502622 Simplifying x + 6 = -5.291502622 Reorder the terms: 6 + x = -5.291502622 Solving 6 + x = -5.291502622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -5.291502622 + -6 Combine like terms: 6 + -6 = 0 0 + x = -5.291502622 + -6 x = -5.291502622 + -6 Combine like terms: -5.291502622 + -6 = -11.291502622 x = -11.291502622 Simplifying x = -11.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.708497378, -11.291502622}

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