9x^2+6x-85=0

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Solution for 9x^2+6x-85=0 equation: 


Simplifying
9x2 + 6x + -85 = 0

Reorder the terms:
-85 + 6x + 9x2 = 0

Solving
-85 + 6x + 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'.
-9.444444444 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '9.444444444' to each side of the equation.
-9.444444444 + 0.6666666667x + 9.444444444 + x2 = 0 + 9.444444444

Reorder the terms:
-9.444444444 + 9.444444444 + 0.6666666667x + x2 = 0 + 9.444444444

Combine like terms: -9.444444444 + 9.444444444 = 0.000000000
0.000000000 + 0.6666666667x + x2 = 0 + 9.444444444
0.6666666667x + x2 = 0 + 9.444444444

Combine like terms: 0 + 9.444444444 = 9.444444444
0.6666666667x + x2 = 9.444444444

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 = 9.444444444 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 9.444444444 + 0.1111111112

Combine like terms: 9.444444444 + 0.1111111112 = 9.5555555552
0.1111111112 + 0.6666666667x + x2 = 9.5555555552

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 9.5555555552

Calculate the square root of the right side: 3.091206165

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 3.091206165 and -3.091206165.


Subproblem 1
x + 0.3333333334 = 3.091206165

Simplifying
x + 0.3333333334 = 3.091206165

Reorder the terms:
0.3333333334 + x = 3.091206165

Solving
0.3333333334 + x = 3.091206165

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 = 3.091206165 + -0.3333333334

Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000
0.0000000000 + x = 3.091206165 + -0.3333333334
x = 3.091206165 + -0.3333333334

Combine like terms: 3.091206165 + -0.3333333334 = 2.7578728316
x = 2.7578728316

Simplifying
x = 2.7578728316


Subproblem 2
x + 0.3333333334 = -3.091206165

Simplifying
x + 0.3333333334 = -3.091206165

Reorder the terms:
0.3333333334 + x = -3.091206165

Solving
0.3333333334 + x = -3.091206165

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 = -3.091206165 + -0.3333333334

Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000
0.0000000000 + x = -3.091206165 + -0.3333333334
x = -3.091206165 + -0.3333333334

Combine like terms: -3.091206165 + -0.3333333334 = -3.4245394984
x = -3.4245394984

Simplifying
x = -3.4245394984


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {2.7578728316, -3.4245394984}

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