9x(x+12)=-13

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Solution for 9x(x+12)=-13 equation:


Simplifying
9x(x + 12) = -13

Reorder the terms:
9x(12 + x) = -13
(12 * 9x + x * 9x) = -13
(108x + 9x2) = -13

Solving
108x + 9x2 = -13

Solving for variable 'x'.

Reorder the terms:
13 + 108x + 9x2 = -13 + 13

Combine like terms: -13 + 13 = 0
13 + 108x + 9x2 = 0

Begin completing the square.  Divide all terms by
9 the coefficient of the squared term: 

Divide each side by '9'.
1.444444444 + 12x + x2 = 0

Move the constant term to the right:

Add '-1.444444444' to each side of the equation.
1.444444444 + 12x + -1.444444444 + x2 = 0 + -1.444444444

Reorder the terms:
1.444444444 + -1.444444444 + 12x + x2 = 0 + -1.444444444

Combine like terms: 1.444444444 + -1.444444444 = 0.000000000
0.000000000 + 12x + x2 = 0 + -1.444444444
12x + x2 = 0 + -1.444444444

Combine like terms: 0 + -1.444444444 = -1.444444444
12x + x2 = -1.444444444

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 = -1.444444444 + 36

Reorder the terms:
36 + 12x + x2 = -1.444444444 + 36

Combine like terms: -1.444444444 + 36 = 34.555555556
36 + 12x + x2 = 34.555555556

Factor a perfect square on the left side:
(x + 6)(x + 6) = 34.555555556

Calculate the square root of the right side: 5.878397363

Break this problem into two subproblems by setting 
(x + 6) equal to 5.878397363 and -5.878397363.

Subproblem 1

x + 6 = 5.878397363 Simplifying x + 6 = 5.878397363 Reorder the terms: 6 + x = 5.878397363 Solving 6 + x = 5.878397363 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 = 5.878397363 + -6 Combine like terms: 6 + -6 = 0 0 + x = 5.878397363 + -6 x = 5.878397363 + -6 Combine like terms: 5.878397363 + -6 = -0.121602637 x = -0.121602637 Simplifying x = -0.121602637

Subproblem 2

x + 6 = -5.878397363 Simplifying x + 6 = -5.878397363 Reorder the terms: 6 + x = -5.878397363 Solving 6 + x = -5.878397363 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 = -5.878397363 + -6 Combine like terms: 6 + -6 = 0 0 + x = -5.878397363 + -6 x = -5.878397363 + -6 Combine like terms: -5.878397363 + -6 = -11.878397363 x = -11.878397363 Simplifying x = -11.878397363

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.121602637, -11.878397363}

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