11x^2-9x-1=0

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Solution for 11x^2-9x-1=0 equation:


Simplifying
11x2 + -9x + -1 = 0

Reorder the terms:
-1 + -9x + 11x2 = 0

Solving
-1 + -9x + 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'.
-0.09090909091 + -0.8181818182x + x2 = 0

Move the constant term to the right:

Add '0.09090909091' to each side of the equation.
-0.09090909091 + -0.8181818182x + 0.09090909091 + x2 = 0 + 0.09090909091

Reorder the terms:
-0.09090909091 + 0.09090909091 + -0.8181818182x + x2 = 0 + 0.09090909091

Combine like terms: -0.09090909091 + 0.09090909091 = 0.00000000000
0.00000000000 + -0.8181818182x + x2 = 0 + 0.09090909091
-0.8181818182x + x2 = 0 + 0.09090909091

Combine like terms: 0 + 0.09090909091 = 0.09090909091
-0.8181818182x + x2 = 0.09090909091

The x term is -0.8181818182x.  Take half its coefficient (-0.4090909091).
Square it (0.1673553719) and add it to both sides.

Add '0.1673553719' to each side of the equation.
-0.8181818182x + 0.1673553719 + x2 = 0.09090909091 + 0.1673553719

Reorder the terms:
0.1673553719 + -0.8181818182x + x2 = 0.09090909091 + 0.1673553719

Combine like terms: 0.09090909091 + 0.1673553719 = 0.25826446281
0.1673553719 + -0.8181818182x + x2 = 0.25826446281

Factor a perfect square on the left side:
(x + -0.4090909091)(x + -0.4090909091) = 0.25826446281

Calculate the square root of the right side: 0.508197268

Break this problem into two subproblems by setting 
(x + -0.4090909091) equal to 0.508197268 and -0.508197268.

Subproblem 1

x + -0.4090909091 = 0.508197268 Simplifying x + -0.4090909091 = 0.508197268 Reorder the terms: -0.4090909091 + x = 0.508197268 Solving -0.4090909091 + x = 0.508197268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4090909091' to each side of the equation. -0.4090909091 + 0.4090909091 + x = 0.508197268 + 0.4090909091 Combine like terms: -0.4090909091 + 0.4090909091 = 0.0000000000 0.0000000000 + x = 0.508197268 + 0.4090909091 x = 0.508197268 + 0.4090909091 Combine like terms: 0.508197268 + 0.4090909091 = 0.9172881771 x = 0.9172881771 Simplifying x = 0.9172881771

Subproblem 2

x + -0.4090909091 = -0.508197268 Simplifying x + -0.4090909091 = -0.508197268 Reorder the terms: -0.4090909091 + x = -0.508197268 Solving -0.4090909091 + x = -0.508197268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4090909091' to each side of the equation. -0.4090909091 + 0.4090909091 + x = -0.508197268 + 0.4090909091 Combine like terms: -0.4090909091 + 0.4090909091 = 0.0000000000 0.0000000000 + x = -0.508197268 + 0.4090909091 x = -0.508197268 + 0.4090909091 Combine like terms: -0.508197268 + 0.4090909091 = -0.0991063589 x = -0.0991063589 Simplifying x = -0.0991063589

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.9172881771, -0.0991063589}

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