0=9x^2-6x-74

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Solution for 0=9x^2-6x-74 equation:


Simplifying
0 = 9x2 + -6x + -74

Reorder the terms:
0 = -74 + -6x + 9x2

Solving
0 = -74 + -6x + 9x2

Solving for variable 'x'.

Combine like terms: 0 + 74 = 74
74 + 6x + -9x2 = -74 + -6x + 9x2 + 74 + 6x + -9x2

Reorder the terms:
74 + 6x + -9x2 = -74 + 74 + -6x + 6x + 9x2 + -9x2

Combine like terms: -74 + 74 = 0
74 + 6x + -9x2 = 0 + -6x + 6x + 9x2 + -9x2
74 + 6x + -9x2 = -6x + 6x + 9x2 + -9x2

Combine like terms: -6x + 6x = 0
74 + 6x + -9x2 = 0 + 9x2 + -9x2
74 + 6x + -9x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
74 + 6x + -9x2 = 0

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

Divide each side by '-9'.
-8.222222222 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '8.222222222' to each side of the equation.
-8.222222222 + -0.6666666667x + 8.222222222 + x2 = 0 + 8.222222222

Reorder the terms:
-8.222222222 + 8.222222222 + -0.6666666667x + x2 = 0 + 8.222222222

Combine like terms: -8.222222222 + 8.222222222 = 0.000000000
0.000000000 + -0.6666666667x + x2 = 0 + 8.222222222
-0.6666666667x + x2 = 0 + 8.222222222

Combine like terms: 0 + 8.222222222 = 8.222222222
-0.6666666667x + x2 = 8.222222222

The x term is -0.6666666667x.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667x + 0.1111111112 + x2 = 8.222222222 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 8.222222222 + 0.1111111112

Combine like terms: 8.222222222 + 0.1111111112 = 8.3333333332
0.1111111112 + -0.6666666667x + x2 = 8.3333333332

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 8.3333333332

Calculate the square root of the right side: 2.886751346

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 2.886751346 and -2.886751346.

Subproblem 1

x + -0.3333333334 = 2.886751346 Simplifying x + -0.3333333334 = 2.886751346 Reorder the terms: -0.3333333334 + x = 2.886751346 Solving -0.3333333334 + x = 2.886751346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = 2.886751346 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 2.886751346 + 0.3333333334 x = 2.886751346 + 0.3333333334 Combine like terms: 2.886751346 + 0.3333333334 = 3.2200846794 x = 3.2200846794 Simplifying x = 3.2200846794

Subproblem 2

x + -0.3333333334 = -2.886751346 Simplifying x + -0.3333333334 = -2.886751346 Reorder the terms: -0.3333333334 + x = -2.886751346 Solving -0.3333333334 + x = -2.886751346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = -2.886751346 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -2.886751346 + 0.3333333334 x = -2.886751346 + 0.3333333334 Combine like terms: -2.886751346 + 0.3333333334 = -2.5534180126 x = -2.5534180126 Simplifying x = -2.5534180126

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.2200846794, -2.5534180126}

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