(2x^2+4x-6)+(11x+1)=0

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Solution for (2x^2+4x-6)+(11x+1)=0 equation:


Simplifying
(2x2 + 4x + -6) + (11x + 1) = 0

Reorder the terms:
(-6 + 4x + 2x2) + (11x + 1) = 0

Remove parenthesis around (-6 + 4x + 2x2)
-6 + 4x + 2x2 + (11x + 1) = 0

Reorder the terms:
-6 + 4x + 2x2 + (1 + 11x) = 0

Remove parenthesis around (1 + 11x)
-6 + 4x + 2x2 + 1 + 11x = 0

Reorder the terms:
-6 + 1 + 4x + 11x + 2x2 = 0

Combine like terms: -6 + 1 = -5
-5 + 4x + 11x + 2x2 = 0

Combine like terms: 4x + 11x = 15x
-5 + 15x + 2x2 = 0

Solving
-5 + 15x + 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'.
-2.5 + 7.5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 7.5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 7.5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 7.5x + x2 = 0 + 2.5
7.5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
7.5x + x2 = 2.5

The x term is 7.5x.  Take half its coefficient (3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
7.5x + 14.0625 + x2 = 2.5 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = 2.5 + 14.0625

Combine like terms: 2.5 + 14.0625 = 16.5625
14.0625 + 7.5x + x2 = 16.5625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 16.5625

Calculate the square root of the right side: 4.069705149

Break this problem into two subproblems by setting 
(x + 3.75) equal to 4.069705149 and -4.069705149.

Subproblem 1

x + 3.75 = 4.069705149 Simplifying x + 3.75 = 4.069705149 Reorder the terms: 3.75 + x = 4.069705149 Solving 3.75 + x = 4.069705149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = 4.069705149 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 4.069705149 + -3.75 x = 4.069705149 + -3.75 Combine like terms: 4.069705149 + -3.75 = 0.319705149 x = 0.319705149 Simplifying x = 0.319705149

Subproblem 2

x + 3.75 = -4.069705149 Simplifying x + 3.75 = -4.069705149 Reorder the terms: 3.75 + x = -4.069705149 Solving 3.75 + x = -4.069705149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = -4.069705149 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -4.069705149 + -3.75 x = -4.069705149 + -3.75 Combine like terms: -4.069705149 + -3.75 = -7.819705149 x = -7.819705149 Simplifying x = -7.819705149

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.319705149, -7.819705149}

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