2x^2-12x-36=(x+2)

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Solution for 2x^2-12x-36=(x+2) equation:


Simplifying
2x2 + -12x + -36 = (x + 2)

Reorder the terms:
-36 + -12x + 2x2 = (x + 2)

Reorder the terms:
-36 + -12x + 2x2 = (2 + x)

Remove parenthesis around (2 + x)
-36 + -12x + 2x2 = 2 + x

Solving
-36 + -12x + 2x2 = 2 + x

Solving for variable 'x'.

Reorder the terms:
-36 + -2 + -12x + -1x + 2x2 = 2 + x + -2 + -1x

Combine like terms: -36 + -2 = -38
-38 + -12x + -1x + 2x2 = 2 + x + -2 + -1x

Combine like terms: -12x + -1x = -13x
-38 + -13x + 2x2 = 2 + x + -2 + -1x

Reorder the terms:
-38 + -13x + 2x2 = 2 + -2 + x + -1x

Combine like terms: 2 + -2 = 0
-38 + -13x + 2x2 = 0 + x + -1x
-38 + -13x + 2x2 = x + -1x

Combine like terms: x + -1x = 0
-38 + -13x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-19 + -6.5x + x2 = 0

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -6.5x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + -6.5x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -6.5x + x2 = 0 + 19
-6.5x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
-6.5x + x2 = 19

The x term is -6.5x.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5x + 10.5625 + x2 = 19 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 19 + 10.5625

Combine like terms: 19 + 10.5625 = 29.5625
10.5625 + -6.5x + x2 = 29.5625

Factor a perfect square on the left side:
(x + -3.25)(x + -3.25) = 29.5625

Calculate the square root of the right side: 5.437140793

Break this problem into two subproblems by setting 
(x + -3.25) equal to 5.437140793 and -5.437140793.

Subproblem 1

x + -3.25 = 5.437140793 Simplifying x + -3.25 = 5.437140793 Reorder the terms: -3.25 + x = 5.437140793 Solving -3.25 + x = 5.437140793 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = 5.437140793 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 5.437140793 + 3.25 x = 5.437140793 + 3.25 Combine like terms: 5.437140793 + 3.25 = 8.687140793 x = 8.687140793 Simplifying x = 8.687140793

Subproblem 2

x + -3.25 = -5.437140793 Simplifying x + -3.25 = -5.437140793 Reorder the terms: -3.25 + x = -5.437140793 Solving -3.25 + x = -5.437140793 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = -5.437140793 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -5.437140793 + 3.25 x = -5.437140793 + 3.25 Combine like terms: -5.437140793 + 3.25 = -2.187140793 x = -2.187140793 Simplifying x = -2.187140793

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.687140793, -2.187140793}

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