2x^2-12+4x=x^2-4x-2

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Solution for 2x^2-12+4x=x^2-4x-2 equation:


Simplifying
2x2 + -12 + 4x = x2 + -4x + -2

Reorder the terms:
-12 + 4x + 2x2 = x2 + -4x + -2

Reorder the terms:
-12 + 4x + 2x2 = -2 + -4x + x2

Solving
-12 + 4x + 2x2 = -2 + -4x + x2

Solving for variable 'x'.

Reorder the terms:
-12 + 2 + 4x + 4x + 2x2 + -1x2 = -2 + -4x + x2 + 2 + 4x + -1x2

Combine like terms: -12 + 2 = -10
-10 + 4x + 4x + 2x2 + -1x2 = -2 + -4x + x2 + 2 + 4x + -1x2

Combine like terms: 4x + 4x = 8x
-10 + 8x + 2x2 + -1x2 = -2 + -4x + x2 + 2 + 4x + -1x2

Combine like terms: 2x2 + -1x2 = 1x2
-10 + 8x + 1x2 = -2 + -4x + x2 + 2 + 4x + -1x2

Reorder the terms:
-10 + 8x + 1x2 = -2 + 2 + -4x + 4x + x2 + -1x2

Combine like terms: -2 + 2 = 0
-10 + 8x + 1x2 = 0 + -4x + 4x + x2 + -1x2
-10 + 8x + 1x2 = -4x + 4x + x2 + -1x2

Combine like terms: -4x + 4x = 0
-10 + 8x + 1x2 = 0 + x2 + -1x2
-10 + 8x + 1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-10 + 8x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 8x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + 8x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 8x + x2 = 0 + 10
8x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
8x + x2 = 10

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 10 + 16

Reorder the terms:
16 + 8x + x2 = 10 + 16

Combine like terms: 10 + 16 = 26
16 + 8x + x2 = 26

Factor a perfect square on the left side:
(x + 4)(x + 4) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(x + 4) equal to 5.099019514 and -5.099019514.

Subproblem 1

x + 4 = 5.099019514 Simplifying x + 4 = 5.099019514 Reorder the terms: 4 + x = 5.099019514 Solving 4 + x = 5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 5.099019514 + -4 Combine like terms: 4 + -4 = 0 0 + x = 5.099019514 + -4 x = 5.099019514 + -4 Combine like terms: 5.099019514 + -4 = 1.099019514 x = 1.099019514 Simplifying x = 1.099019514

Subproblem 2

x + 4 = -5.099019514 Simplifying x + 4 = -5.099019514 Reorder the terms: 4 + x = -5.099019514 Solving 4 + x = -5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -5.099019514 + -4 Combine like terms: 4 + -4 = 0 0 + x = -5.099019514 + -4 x = -5.099019514 + -4 Combine like terms: -5.099019514 + -4 = -9.099019514 x = -9.099019514 Simplifying x = -9.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.099019514, -9.099019514}

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