x*x-2x=3x+108

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Solution for x*x-2x=3x+108 equation:


Simplifying
x * x + -2x = 3x + 108

Multiply x * x
x2 + -2x = 3x + 108

Reorder the terms:
-2x + x2 = 3x + 108

Reorder the terms:
-2x + x2 = 108 + 3x

Solving
-2x + x2 = 108 + 3x

Solving for variable 'x'.

Reorder the terms:
-108 + -2x + -3x + x2 = 108 + 3x + -108 + -3x

Combine like terms: -2x + -3x = -5x
-108 + -5x + x2 = 108 + 3x + -108 + -3x

Reorder the terms:
-108 + -5x + x2 = 108 + -108 + 3x + -3x

Combine like terms: 108 + -108 = 0
-108 + -5x + x2 = 0 + 3x + -3x
-108 + -5x + x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-108 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '108' to each side of the equation.
-108 + -5x + 108 + x2 = 0 + 108

Reorder the terms:
-108 + 108 + -5x + x2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + -5x + x2 = 0 + 108
-5x + x2 = 0 + 108

Combine like terms: 0 + 108 = 108
-5x + x2 = 108

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 108 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 108 + 6.25

Combine like terms: 108 + 6.25 = 114.25
6.25 + -5x + x2 = 114.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 114.25

Calculate the square root of the right side: 10.688779163

Break this problem into two subproblems by setting 
(x + -2.5) equal to 10.688779163 and -10.688779163.

Subproblem 1

x + -2.5 = 10.688779163 Simplifying x + -2.5 = 10.688779163 Reorder the terms: -2.5 + x = 10.688779163 Solving -2.5 + x = 10.688779163 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 10.688779163 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 10.688779163 + 2.5 x = 10.688779163 + 2.5 Combine like terms: 10.688779163 + 2.5 = 13.188779163 x = 13.188779163 Simplifying x = 13.188779163

Subproblem 2

x + -2.5 = -10.688779163 Simplifying x + -2.5 = -10.688779163 Reorder the terms: -2.5 + x = -10.688779163 Solving -2.5 + x = -10.688779163 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -10.688779163 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -10.688779163 + 2.5 x = -10.688779163 + 2.5 Combine like terms: -10.688779163 + 2.5 = -8.188779163 x = -8.188779163 Simplifying x = -8.188779163

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.188779163, -8.188779163}

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