2x^2+11x+6=0

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


Simplifying
2x2 + 11x + 6 = 0

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

Solving
6 + 11x + 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'.
3 + 5.5x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 5.5x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 5.5x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 5.5x + x2 = 0 + -3
5.5x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
5.5x + x2 = -3

The x term is 5.5x.  Take half its coefficient (2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
5.5x + 7.5625 + x2 = -3 + 7.5625

Reorder the terms:
7.5625 + 5.5x + x2 = -3 + 7.5625

Combine like terms: -3 + 7.5625 = 4.5625
7.5625 + 5.5x + x2 = 4.5625

Factor a perfect square on the left side:
(x + 2.75)(x + 2.75) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(x + 2.75) equal to 2.136000936 and -2.136000936.

Subproblem 1

x + 2.75 = 2.136000936 Simplifying x + 2.75 = 2.136000936 Reorder the terms: 2.75 + x = 2.136000936 Solving 2.75 + x = 2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = 2.136000936 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = 2.136000936 + -2.75 x = 2.136000936 + -2.75 Combine like terms: 2.136000936 + -2.75 = -0.613999064 x = -0.613999064 Simplifying x = -0.613999064

Subproblem 2

x + 2.75 = -2.136000936 Simplifying x + 2.75 = -2.136000936 Reorder the terms: 2.75 + x = -2.136000936 Solving 2.75 + x = -2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = -2.136000936 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = -2.136000936 + -2.75 x = -2.136000936 + -2.75 Combine like terms: -2.136000936 + -2.75 = -4.886000936 x = -4.886000936 Simplifying x = -4.886000936

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.613999064, -4.886000936}

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