x*x+12x-26=0

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Solution for x*x+12x-26=0 equation:


Simplifying
x * x + 12x + -26 = 0

Multiply x * x
x2 + 12x + -26 = 0

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

Solving
-26 + 12x + x2 = 0

Solving for variable 'x'.

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 = 62
36 + 12x + x2 = 62

Factor a perfect square on the left side:
(x + 6)(x + 6) = 62

Calculate the square root of the right side: 7.874007874

Break this problem into two subproblems by setting 
(x + 6) equal to 7.874007874 and -7.874007874.

Subproblem 1

x + 6 = 7.874007874 Simplifying x + 6 = 7.874007874 Reorder the terms: 6 + x = 7.874007874 Solving 6 + x = 7.874007874 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 = 7.874007874 + -6 Combine like terms: 6 + -6 = 0 0 + x = 7.874007874 + -6 x = 7.874007874 + -6 Combine like terms: 7.874007874 + -6 = 1.874007874 x = 1.874007874 Simplifying x = 1.874007874

Subproblem 2

x + 6 = -7.874007874 Simplifying x + 6 = -7.874007874 Reorder the terms: 6 + x = -7.874007874 Solving 6 + x = -7.874007874 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 = -7.874007874 + -6 Combine like terms: 6 + -6 = 0 0 + x = -7.874007874 + -6 x = -7.874007874 + -6 Combine like terms: -7.874007874 + -6 = -13.874007874 x = -13.874007874 Simplifying x = -13.874007874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.874007874, -13.874007874}

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