11x^2-6x-9=0

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Solution for 11x^2-6x-9=0 equation:


Simplifying
11x2 + -6x + -9 = 0

Reorder the terms:
-9 + -6x + 11x2 = 0

Solving
-9 + -6x + 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'.
-0.8181818182 + -0.5454545455x + x2 = 0

Move the constant term to the right:

Add '0.8181818182' to each side of the equation.
-0.8181818182 + -0.5454545455x + 0.8181818182 + x2 = 0 + 0.8181818182

Reorder the terms:
-0.8181818182 + 0.8181818182 + -0.5454545455x + x2 = 0 + 0.8181818182

Combine like terms: -0.8181818182 + 0.8181818182 = 0.0000000000
0.0000000000 + -0.5454545455x + x2 = 0 + 0.8181818182
-0.5454545455x + x2 = 0 + 0.8181818182

Combine like terms: 0 + 0.8181818182 = 0.8181818182
-0.5454545455x + x2 = 0.8181818182

The x term is -0.5454545455x.  Take half its coefficient (-0.2727272728).
Square it (0.07438016533) and add it to both sides.

Add '0.07438016533' to each side of the equation.
-0.5454545455x + 0.07438016533 + x2 = 0.8181818182 + 0.07438016533

Reorder the terms:
0.07438016533 + -0.5454545455x + x2 = 0.8181818182 + 0.07438016533

Combine like terms: 0.8181818182 + 0.07438016533 = 0.89256198353
0.07438016533 + -0.5454545455x + x2 = 0.89256198353

Factor a perfect square on the left side:
(x + -0.2727272728)(x + -0.2727272728) = 0.89256198353

Calculate the square root of the right side: 0.944754986

Break this problem into two subproblems by setting 
(x + -0.2727272728) equal to 0.944754986 and -0.944754986.

Subproblem 1

x + -0.2727272728 = 0.944754986 Simplifying x + -0.2727272728 = 0.944754986 Reorder the terms: -0.2727272728 + x = 0.944754986 Solving -0.2727272728 + x = 0.944754986 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2727272728' to each side of the equation. -0.2727272728 + 0.2727272728 + x = 0.944754986 + 0.2727272728 Combine like terms: -0.2727272728 + 0.2727272728 = 0.0000000000 0.0000000000 + x = 0.944754986 + 0.2727272728 x = 0.944754986 + 0.2727272728 Combine like terms: 0.944754986 + 0.2727272728 = 1.2174822588 x = 1.2174822588 Simplifying x = 1.2174822588

Subproblem 2

x + -0.2727272728 = -0.944754986 Simplifying x + -0.2727272728 = -0.944754986 Reorder the terms: -0.2727272728 + x = -0.944754986 Solving -0.2727272728 + x = -0.944754986 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2727272728' to each side of the equation. -0.2727272728 + 0.2727272728 + x = -0.944754986 + 0.2727272728 Combine like terms: -0.2727272728 + 0.2727272728 = 0.0000000000 0.0000000000 + x = -0.944754986 + 0.2727272728 x = -0.944754986 + 0.2727272728 Combine like terms: -0.944754986 + 0.2727272728 = -0.6720277132 x = -0.6720277132 Simplifying x = -0.6720277132

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2174822588, -0.6720277132}

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