-9x^2-12x+2=0

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Solution for -9x^2-12x+2=0 equation:


Simplifying
-9x2 + -12x + 2 = 0

Reorder the terms:
2 + -12x + -9x2 = 0

Solving
2 + -12x + -9x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-9 the coefficient of the squared term: 

Divide each side by '-9'.
-0.2222222222 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + 1.333333333x + 0.2222222222 + x2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + 1.333333333x + x2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + 1.333333333x + x2 = 0 + 0.2222222222
1.333333333x + x2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
1.333333333x + x2 = 0.2222222222

The x term is 1.333333333x.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333x + 0.4444444442 + x2 = 0.2222222222 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = 0.2222222222 + 0.4444444442

Combine like terms: 0.2222222222 + 0.4444444442 = 0.6666666664
0.4444444442 + 1.333333333x + x2 = 0.6666666664

Factor a perfect square on the left side:
(x + 0.6666666665)(x + 0.6666666665) = 0.6666666664

Calculate the square root of the right side: 0.816496581

Break this problem into two subproblems by setting 
(x + 0.6666666665) equal to 0.816496581 and -0.816496581.

Subproblem 1

x + 0.6666666665 = 0.816496581 Simplifying x + 0.6666666665 = 0.816496581 Reorder the terms: 0.6666666665 + x = 0.816496581 Solving 0.6666666665 + x = 0.816496581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = 0.816496581 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 0.816496581 + -0.6666666665 x = 0.816496581 + -0.6666666665 Combine like terms: 0.816496581 + -0.6666666665 = 0.1498299145 x = 0.1498299145 Simplifying x = 0.1498299145

Subproblem 2

x + 0.6666666665 = -0.816496581 Simplifying x + 0.6666666665 = -0.816496581 Reorder the terms: 0.6666666665 + x = -0.816496581 Solving 0.6666666665 + x = -0.816496581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = -0.816496581 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -0.816496581 + -0.6666666665 x = -0.816496581 + -0.6666666665 Combine like terms: -0.816496581 + -0.6666666665 = -1.4831632475 x = -1.4831632475 Simplifying x = -1.4831632475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.1498299145, -1.4831632475}

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