x^2+12x=-26

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Solution for x^2+12x=-26 equation:


Simplifying
x2 + 12x = -26

Reorder the terms:
12x + x2 = -26

Solving
12x + x2 = -26

Solving for variable 'x'.

Reorder the terms:
26 + 12x + x2 = -26 + 26

Combine like terms: -26 + 26 = 0
26 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-26' to each side of the equation.
26 + 12x + -26 + x2 = 0 + -26

Reorder the terms:
26 + -26 + 12x + x2 = 0 + -26

Combine like terms: 26 + -26 = 0
0 + 12x + x2 = 0 + -26
12x + x2 = 0 + -26

Combine like terms: 0 + -26 = -26
12x + x2 = -26

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 = -26 + 36

Reorder the terms:
36 + 12x + x2 = -26 + 36

Combine like terms: -26 + 36 = 10
36 + 12x + x2 = 10

Factor a perfect square on the left side:
(x + 6)(x + 6) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(x + 6) equal to 3.16227766 and -3.16227766.

Subproblem 1

x + 6 = 3.16227766 Simplifying x + 6 = 3.16227766 Reorder the terms: 6 + x = 3.16227766 Solving 6 + x = 3.16227766 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 = 3.16227766 + -6 Combine like terms: 6 + -6 = 0 0 + x = 3.16227766 + -6 x = 3.16227766 + -6 Combine like terms: 3.16227766 + -6 = -2.83772234 x = -2.83772234 Simplifying x = -2.83772234

Subproblem 2

x + 6 = -3.16227766 Simplifying x + 6 = -3.16227766 Reorder the terms: 6 + x = -3.16227766 Solving 6 + x = -3.16227766 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 = -3.16227766 + -6 Combine like terms: 6 + -6 = 0 0 + x = -3.16227766 + -6 x = -3.16227766 + -6 Combine like terms: -3.16227766 + -6 = -9.16227766 x = -9.16227766 Simplifying x = -9.16227766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.83772234, -9.16227766}

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