x=26-12x-x^2

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


Simplifying
x = 26 + -12x + -1x2

Solving
x = 26 + -12x + -1x2

Solving for variable 'x'.

Reorder the terms:
-26 + x + 12x + x2 = 26 + -12x + -1x2 + -26 + 12x + x2

Combine like terms: x + 12x = 13x
-26 + 13x + x2 = 26 + -12x + -1x2 + -26 + 12x + x2

Reorder the terms:
-26 + 13x + x2 = 26 + -26 + -12x + 12x + -1x2 + x2

Combine like terms: 26 + -26 = 0
-26 + 13x + x2 = 0 + -12x + 12x + -1x2 + x2
-26 + 13x + x2 = -12x + 12x + -1x2 + x2

Combine like terms: -12x + 12x = 0
-26 + 13x + x2 = 0 + -1x2 + x2
-26 + 13x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-26 + 13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + 13x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + 13x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + 13x + x2 = 0 + 26
13x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
13x + x2 = 26

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 = 26 + 42.25

Reorder the terms:
42.25 + 13x + x2 = 26 + 42.25

Combine like terms: 26 + 42.25 = 68.25
42.25 + 13x + x2 = 68.25

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 68.25

Calculate the square root of the right side: 8.261355821

Break this problem into two subproblems by setting 
(x + 6.5) equal to 8.261355821 and -8.261355821.

Subproblem 1

x + 6.5 = 8.261355821 Simplifying x + 6.5 = 8.261355821 Reorder the terms: 6.5 + x = 8.261355821 Solving 6.5 + x = 8.261355821 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 = 8.261355821 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 8.261355821 + -6.5 x = 8.261355821 + -6.5 Combine like terms: 8.261355821 + -6.5 = 1.761355821 x = 1.761355821 Simplifying x = 1.761355821

Subproblem 2

x + 6.5 = -8.261355821 Simplifying x + 6.5 = -8.261355821 Reorder the terms: 6.5 + x = -8.261355821 Solving 6.5 + x = -8.261355821 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 = -8.261355821 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -8.261355821 + -6.5 x = -8.261355821 + -6.5 Combine like terms: -8.261355821 + -6.5 = -14.761355821 x = -14.761355821 Simplifying x = -14.761355821

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.761355821, -14.761355821}

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