6x^2+2x+8x+11-4x^2=0

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Solution for 6x^2+2x+8x+11-4x^2=0 equation:


Simplifying
6x2 + 2x + 8x + 11 + -4x2 = 0

Reorder the terms:
11 + 2x + 8x + 6x2 + -4x2 = 0

Combine like terms: 2x + 8x = 10x
11 + 10x + 6x2 + -4x2 = 0

Combine like terms: 6x2 + -4x2 = 2x2
11 + 10x + 2x2 = 0

Solving
11 + 10x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
5.5 + 5x + x2 = 0

Move the constant term to the right:

Add '-5.5' to each side of the equation.
5.5 + 5x + -5.5 + x2 = 0 + -5.5

Reorder the terms:
5.5 + -5.5 + 5x + x2 = 0 + -5.5

Combine like terms: 5.5 + -5.5 = 0.0
0.0 + 5x + x2 = 0 + -5.5
5x + x2 = 0 + -5.5

Combine like terms: 0 + -5.5 = -5.5
5x + x2 = -5.5

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 = -5.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = -5.5 + 6.25

Combine like terms: -5.5 + 6.25 = 0.75
6.25 + 5x + x2 = 0.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 0.75

Calculate the square root of the right side: 0.866025404

Break this problem into two subproblems by setting 
(x + 2.5) equal to 0.866025404 and -0.866025404.

Subproblem 1

x + 2.5 = 0.866025404 Simplifying x + 2.5 = 0.866025404 Reorder the terms: 2.5 + x = 0.866025404 Solving 2.5 + x = 0.866025404 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 = 0.866025404 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 0.866025404 + -2.5 x = 0.866025404 + -2.5 Combine like terms: 0.866025404 + -2.5 = -1.633974596 x = -1.633974596 Simplifying x = -1.633974596

Subproblem 2

x + 2.5 = -0.866025404 Simplifying x + 2.5 = -0.866025404 Reorder the terms: 2.5 + x = -0.866025404 Solving 2.5 + x = -0.866025404 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 = -0.866025404 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -0.866025404 + -2.5 x = -0.866025404 + -2.5 Combine like terms: -0.866025404 + -2.5 = -3.366025404 x = -3.366025404 Simplifying x = -3.366025404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.633974596, -3.366025404}

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