x^2+13x+12=-23

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Solution for x^2+13x+12=-23 equation:


Simplifying
x2 + 13x + 12 = -23

Reorder the terms:
12 + 13x + x2 = -23

Solving
12 + 13x + x2 = -23

Solving for variable 'x'.

Reorder the terms:
12 + 23 + 13x + x2 = -23 + 23

Combine like terms: 12 + 23 = 35
35 + 13x + x2 = -23 + 23

Combine like terms: -23 + 23 = 0
35 + 13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-35' to each side of the equation.
35 + 13x + -35 + x2 = 0 + -35

Reorder the terms:
35 + -35 + 13x + x2 = 0 + -35

Combine like terms: 35 + -35 = 0
0 + 13x + x2 = 0 + -35
13x + x2 = 0 + -35

Combine like terms: 0 + -35 = -35
13x + x2 = -35

The x term is 13x.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13x + 42.25 + x2 = -35 + 42.25

Reorder the terms:
42.25 + 13x + x2 = -35 + 42.25

Combine like terms: -35 + 42.25 = 7.25
42.25 + 13x + x2 = 7.25

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 7.25

Calculate the square root of the right side: 2.692582404

Break this problem into two subproblems by setting 
(x + 6.5) equal to 2.692582404 and -2.692582404.

Subproblem 1

x + 6.5 = 2.692582404 Simplifying x + 6.5 = 2.692582404 Reorder the terms: 6.5 + x = 2.692582404 Solving 6.5 + x = 2.692582404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = 2.692582404 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 2.692582404 + -6.5 x = 2.692582404 + -6.5 Combine like terms: 2.692582404 + -6.5 = -3.807417596 x = -3.807417596 Simplifying x = -3.807417596

Subproblem 2

x + 6.5 = -2.692582404 Simplifying x + 6.5 = -2.692582404 Reorder the terms: 6.5 + x = -2.692582404 Solving 6.5 + x = -2.692582404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = -2.692582404 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -2.692582404 + -6.5 x = -2.692582404 + -6.5 Combine like terms: -2.692582404 + -6.5 = -9.192582404 x = -9.192582404 Simplifying x = -9.192582404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.807417596, -9.192582404}

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