(x^2-6+8)-(-2x^2-4x+90)=

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Solution for (x^2-6+8)-(-2x^2-4x+90)= equation:


Simplifying
(x2 + -6 + 8) + -1(-2x2 + -4x + 90) = 0

Reorder the terms:
(-6 + 8 + x2) + -1(-2x2 + -4x + 90) = 0

Combine like terms: -6 + 8 = 2
(2 + x2) + -1(-2x2 + -4x + 90) = 0

Remove parenthesis around (2 + x2)
2 + x2 + -1(-2x2 + -4x + 90) = 0

Reorder the terms:
2 + x2 + -1(90 + -4x + -2x2) = 0
2 + x2 + (90 * -1 + -4x * -1 + -2x2 * -1) = 0
2 + x2 + (-90 + 4x + 2x2) = 0

Reorder the terms:
2 + -90 + 4x + x2 + 2x2 = 0

Combine like terms: 2 + -90 = -88
-88 + 4x + x2 + 2x2 = 0

Combine like terms: x2 + 2x2 = 3x2
-88 + 4x + 3x2 = 0

Solving
-88 + 4x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-29.33333333 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '29.33333333' to each side of the equation.
-29.33333333 + 1.333333333x + 29.33333333 + x2 = 0 + 29.33333333

Reorder the terms:
-29.33333333 + 29.33333333 + 1.333333333x + x2 = 0 + 29.33333333

Combine like terms: -29.33333333 + 29.33333333 = 0.00000000
0.00000000 + 1.333333333x + x2 = 0 + 29.33333333
1.333333333x + x2 = 0 + 29.33333333

Combine like terms: 0 + 29.33333333 = 29.33333333
1.333333333x + x2 = 29.33333333

The x term is 1.333333333x.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333x + 0.4444444442 + x2 = 29.33333333 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = 29.33333333 + 0.4444444442

Combine like terms: 29.33333333 + 0.4444444442 = 29.7777777742
0.4444444442 + 1.333333333x + x2 = 29.7777777742

Factor a perfect square on the left side:
(x + 0.6666666665)(x + 0.6666666665) = 29.7777777742

Calculate the square root of the right side: 5.456901848

Break this problem into two subproblems by setting 
(x + 0.6666666665) equal to 5.456901848 and -5.456901848.

Subproblem 1

x + 0.6666666665 = 5.456901848 Simplifying x + 0.6666666665 = 5.456901848 Reorder the terms: 0.6666666665 + x = 5.456901848 Solving 0.6666666665 + x = 5.456901848 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = 5.456901848 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 5.456901848 + -0.6666666665 x = 5.456901848 + -0.6666666665 Combine like terms: 5.456901848 + -0.6666666665 = 4.7902351815 x = 4.7902351815 Simplifying x = 4.7902351815

Subproblem 2

x + 0.6666666665 = -5.456901848 Simplifying x + 0.6666666665 = -5.456901848 Reorder the terms: 0.6666666665 + x = -5.456901848 Solving 0.6666666665 + x = -5.456901848 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = -5.456901848 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -5.456901848 + -0.6666666665 x = -5.456901848 + -0.6666666665 Combine like terms: -5.456901848 + -0.6666666665 = -6.1235685145 x = -6.1235685145 Simplifying x = -6.1235685145

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.7902351815, -6.1235685145}

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