9x^2-12x-133=0

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Solution for 9x^2-12x-133=0 equation:


Simplifying
9x2 + -12x + -133 = 0

Reorder the terms:
-133 + -12x + 9x2 = 0

Solving
-133 + -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'.
-14.77777778 + -1.333333333x + x2 = 0

Move the constant term to the right:

Add '14.77777778' to each side of the equation.
-14.77777778 + -1.333333333x + 14.77777778 + x2 = 0 + 14.77777778

Reorder the terms:
-14.77777778 + 14.77777778 + -1.333333333x + x2 = 0 + 14.77777778

Combine like terms: -14.77777778 + 14.77777778 = 0.00000000
0.00000000 + -1.333333333x + x2 = 0 + 14.77777778
-1.333333333x + x2 = 0 + 14.77777778

Combine like terms: 0 + 14.77777778 = 14.77777778
-1.333333333x + x2 = 14.77777778

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 = 14.77777778 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333x + x2 = 14.77777778 + 0.4444444442

Combine like terms: 14.77777778 + 0.4444444442 = 15.2222222242
0.4444444442 + -1.333333333x + x2 = 15.2222222242

Factor a perfect square on the left side:
(x + -0.6666666665)(x + -0.6666666665) = 15.2222222242

Calculate the square root of the right side: 3.901566637

Break this problem into two subproblems by setting 
(x + -0.6666666665) equal to 3.901566637 and -3.901566637.

Subproblem 1

x + -0.6666666665 = 3.901566637 Simplifying x + -0.6666666665 = 3.901566637 Reorder the terms: -0.6666666665 + x = 3.901566637 Solving -0.6666666665 + x = 3.901566637 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 = 3.901566637 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = 3.901566637 + 0.6666666665 x = 3.901566637 + 0.6666666665 Combine like terms: 3.901566637 + 0.6666666665 = 4.5682333035 x = 4.5682333035 Simplifying x = 4.5682333035

Subproblem 2

x + -0.6666666665 = -3.901566637 Simplifying x + -0.6666666665 = -3.901566637 Reorder the terms: -0.6666666665 + x = -3.901566637 Solving -0.6666666665 + x = -3.901566637 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 = -3.901566637 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = -3.901566637 + 0.6666666665 x = -3.901566637 + 0.6666666665 Combine like terms: -3.901566637 + 0.6666666665 = -3.2348999705 x = -3.2348999705 Simplifying x = -3.2348999705

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.5682333035, -3.2348999705}

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