11x^2-9x-11=0

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


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

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

Solving
-11 + -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'.
-1 + -0.8181818182x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.8181818182x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.8181818182x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.8181818182x + x2 = 0 + 1
-0.8181818182x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.8181818182x + x2 = 1

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 = 1 + 0.1673553719

Reorder the terms:
0.1673553719 + -0.8181818182x + x2 = 1 + 0.1673553719

Combine like terms: 1 + 0.1673553719 = 1.1673553719
0.1673553719 + -0.8181818182x + x2 = 1.1673553719

Factor a perfect square on the left side:
(x + -0.4090909091)(x + -0.4090909091) = 1.1673553719

Calculate the square root of the right side: 1.080442211

Break this problem into two subproblems by setting 
(x + -0.4090909091) equal to 1.080442211 and -1.080442211.

Subproblem 1

x + -0.4090909091 = 1.080442211 Simplifying x + -0.4090909091 = 1.080442211 Reorder the terms: -0.4090909091 + x = 1.080442211 Solving -0.4090909091 + x = 1.080442211 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 = 1.080442211 + 0.4090909091 Combine like terms: -0.4090909091 + 0.4090909091 = 0.0000000000 0.0000000000 + x = 1.080442211 + 0.4090909091 x = 1.080442211 + 0.4090909091 Combine like terms: 1.080442211 + 0.4090909091 = 1.4895331201 x = 1.4895331201 Simplifying x = 1.4895331201

Subproblem 2

x + -0.4090909091 = -1.080442211 Simplifying x + -0.4090909091 = -1.080442211 Reorder the terms: -0.4090909091 + x = -1.080442211 Solving -0.4090909091 + x = -1.080442211 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 = -1.080442211 + 0.4090909091 Combine like terms: -0.4090909091 + 0.4090909091 = 0.0000000000 0.0000000000 + x = -1.080442211 + 0.4090909091 x = -1.080442211 + 0.4090909091 Combine like terms: -1.080442211 + 0.4090909091 = -0.6713513019 x = -0.6713513019 Simplifying x = -0.6713513019

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.4895331201, -0.6713513019}

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