9x^2-30x-26=0

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Solution for 9x^2-30x-26=0 equation: 


Simplifying
9x2 + -30x + -26 = 0

Reorder the terms:
-26 + -30x + 9x2 = 0

Solving
-26 + -30x + 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'.
-2.888888889 + -3.333333333x + x2 = 0

Move the constant term to the right:

Add '2.888888889' to each side of the equation.
-2.888888889 + -3.333333333x + 2.888888889 + x2 = 0 + 2.888888889

Reorder the terms:
-2.888888889 + 2.888888889 + -3.333333333x + x2 = 0 + 2.888888889

Combine like terms: -2.888888889 + 2.888888889 = 0.000000000
0.000000000 + -3.333333333x + x2 = 0 + 2.888888889
-3.333333333x + x2 = 0 + 2.888888889

Combine like terms: 0 + 2.888888889 = 2.888888889
-3.333333333x + x2 = 2.888888889

The x term is -3.333333333x.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333x + 2.777777779 + x2 = 2.888888889 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333x + x2 = 2.888888889 + 2.777777779

Combine like terms: 2.888888889 + 2.777777779 = 5.666666668
2.777777779 + -3.333333333x + x2 = 5.666666668

Factor a perfect square on the left side:
(x + -1.666666667)(x + -1.666666667) = 5.666666668

Calculate the square root of the right side: 2.380476143

Break this problem into two subproblems by setting 
(x + -1.666666667) equal to 2.380476143 and -2.380476143.


Subproblem 1
x + -1.666666667 = 2.380476143

Simplifying
x + -1.666666667 = 2.380476143

Reorder the terms:
-1.666666667 + x = 2.380476143

Solving
-1.666666667 + x = 2.380476143

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1.666666667' to each side of the equation.
-1.666666667 + 1.666666667 + x = 2.380476143 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + x = 2.380476143 + 1.666666667
x = 2.380476143 + 1.666666667

Combine like terms: 2.380476143 + 1.666666667 = 4.04714281
x = 4.04714281

Simplifying
x = 4.04714281


Subproblem 2
x + -1.666666667 = -2.380476143

Simplifying
x + -1.666666667 = -2.380476143

Reorder the terms:
-1.666666667 + x = -2.380476143

Solving
-1.666666667 + x = -2.380476143

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1.666666667' to each side of the equation.
-1.666666667 + 1.666666667 + x = -2.380476143 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + x = -2.380476143 + 1.666666667
x = -2.380476143 + 1.666666667

Combine like terms: -2.380476143 + 1.666666667 = -0.713809476
x = -0.713809476

Simplifying
x = -0.713809476


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.04714281, -0.713809476}

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