x^2-2x+9x+131=180

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Solution for x^2-2x+9x+131=180 equation:


Simplifying
x2 + -2x + 9x + 131 = 180

Reorder the terms:
131 + -2x + 9x + x2 = 180

Combine like terms: -2x + 9x = 7x
131 + 7x + x2 = 180

Solving
131 + 7x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
131 + -180 + 7x + x2 = 180 + -180

Combine like terms: 131 + -180 = -49
-49 + 7x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-49 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + 7x + 49 + x2 = 0 + 49

Reorder the terms:
-49 + 49 + 7x + x2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + 7x + x2 = 0 + 49
7x + x2 = 0 + 49

Combine like terms: 0 + 49 = 49
7x + x2 = 49

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 49 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 49 + 12.25

Combine like terms: 49 + 12.25 = 61.25
12.25 + 7x + x2 = 61.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 61.25

Calculate the square root of the right side: 7.826237921

Break this problem into two subproblems by setting 
(x + 3.5) equal to 7.826237921 and -7.826237921.

Subproblem 1

x + 3.5 = 7.826237921 Simplifying x + 3.5 = 7.826237921 Reorder the terms: 3.5 + x = 7.826237921 Solving 3.5 + x = 7.826237921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 7.826237921 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 7.826237921 + -3.5 x = 7.826237921 + -3.5 Combine like terms: 7.826237921 + -3.5 = 4.326237921 x = 4.326237921 Simplifying x = 4.326237921

Subproblem 2

x + 3.5 = -7.826237921 Simplifying x + 3.5 = -7.826237921 Reorder the terms: 3.5 + x = -7.826237921 Solving 3.5 + x = -7.826237921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -7.826237921 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -7.826237921 + -3.5 x = -7.826237921 + -3.5 Combine like terms: -7.826237921 + -3.5 = -11.326237921 x = -11.326237921 Simplifying x = -11.326237921

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.326237921, -11.326237921}

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