x(x+12)=-28

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Solution for x(x+12)=-28 equation:


Simplifying
x(x + 12) = -28

Reorder the terms:
x(12 + x) = -28
(12 * x + x * x) = -28
(12x + x2) = -28

Solving
12x + x2 = -28

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '-28' to each side of the equation.
28 + 12x + -28 + x2 = 0 + -28

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

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

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

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 = -28 + 36

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

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

Factor a perfect square on the left side:
(x + 6)(x + 6) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(x + 6) equal to 2.828427125 and -2.828427125.

Subproblem 1

x + 6 = 2.828427125 Simplifying x + 6 = 2.828427125 Reorder the terms: 6 + x = 2.828427125 Solving 6 + x = 2.828427125 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 = 2.828427125 + -6 Combine like terms: 6 + -6 = 0 0 + x = 2.828427125 + -6 x = 2.828427125 + -6 Combine like terms: 2.828427125 + -6 = -3.171572875 x = -3.171572875 Simplifying x = -3.171572875

Subproblem 2

x + 6 = -2.828427125 Simplifying x + 6 = -2.828427125 Reorder the terms: 6 + x = -2.828427125 Solving 6 + x = -2.828427125 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 = -2.828427125 + -6 Combine like terms: 6 + -6 = 0 0 + x = -2.828427125 + -6 x = -2.828427125 + -6 Combine like terms: -2.828427125 + -6 = -8.828427125 x = -8.828427125 Simplifying x = -8.828427125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.171572875, -8.828427125}

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