11x^2+12x-8=0

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Solution for 11x^2+12x-8=0 equation:


Simplifying
11x2 + 12x + -8 = 0

Reorder the terms:
-8 + 12x + 11x2 = 0

Solving
-8 + 12x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-0.7272727273 + 1.090909091x + x2 = 0

Move the constant term to the right:

Add '0.7272727273' to each side of the equation.
-0.7272727273 + 1.090909091x + 0.7272727273 + x2 = 0 + 0.7272727273

Reorder the terms:
-0.7272727273 + 0.7272727273 + 1.090909091x + x2 = 0 + 0.7272727273

Combine like terms: -0.7272727273 + 0.7272727273 = 0.0000000000
0.0000000000 + 1.090909091x + x2 = 0 + 0.7272727273
1.090909091x + x2 = 0 + 0.7272727273

Combine like terms: 0 + 0.7272727273 = 0.7272727273
1.090909091x + x2 = 0.7272727273

The x term is 1.090909091x.  Take half its coefficient (0.5454545455).
Square it (0.2975206612) and add it to both sides.

Add '0.2975206612' to each side of the equation.
1.090909091x + 0.2975206612 + x2 = 0.7272727273 + 0.2975206612

Reorder the terms:
0.2975206612 + 1.090909091x + x2 = 0.7272727273 + 0.2975206612

Combine like terms: 0.7272727273 + 0.2975206612 = 1.0247933885
0.2975206612 + 1.090909091x + x2 = 1.0247933885

Factor a perfect square on the left side:
(x + 0.5454545455)(x + 0.5454545455) = 1.0247933885

Calculate the square root of the right side: 1.012320793

Break this problem into two subproblems by setting 
(x + 0.5454545455) equal to 1.012320793 and -1.012320793.

Subproblem 1

x + 0.5454545455 = 1.012320793 Simplifying x + 0.5454545455 = 1.012320793 Reorder the terms: 0.5454545455 + x = 1.012320793 Solving 0.5454545455 + x = 1.012320793 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5454545455' to each side of the equation. 0.5454545455 + -0.5454545455 + x = 1.012320793 + -0.5454545455 Combine like terms: 0.5454545455 + -0.5454545455 = 0.0000000000 0.0000000000 + x = 1.012320793 + -0.5454545455 x = 1.012320793 + -0.5454545455 Combine like terms: 1.012320793 + -0.5454545455 = 0.4668662475 x = 0.4668662475 Simplifying x = 0.4668662475

Subproblem 2

x + 0.5454545455 = -1.012320793 Simplifying x + 0.5454545455 = -1.012320793 Reorder the terms: 0.5454545455 + x = -1.012320793 Solving 0.5454545455 + x = -1.012320793 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5454545455' to each side of the equation. 0.5454545455 + -0.5454545455 + x = -1.012320793 + -0.5454545455 Combine like terms: 0.5454545455 + -0.5454545455 = 0.0000000000 0.0000000000 + x = -1.012320793 + -0.5454545455 x = -1.012320793 + -0.5454545455 Combine like terms: -1.012320793 + -0.5454545455 = -1.5577753385 x = -1.5577753385 Simplifying x = -1.5577753385

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4668662475, -1.5577753385}

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