3x^2-13x-9=0

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Solution for 3x^2-13x-9=0 equation: 


Simplifying
3x2 + -13x + -9 = 0

Reorder the terms:
-9 + -13x + 3x2 = 0

Solving
-9 + -13x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-3 + -4.333333333x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -4.333333333x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -4.333333333x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -4.333333333x + x2 = 0 + 3
-4.333333333x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-4.333333333x + x2 = 3

The x term is -4.333333333x.  Take half its coefficient (-2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
-4.333333333x + 4.694444446 + x2 = 3 + 4.694444446

Reorder the terms:
4.694444446 + -4.333333333x + x2 = 3 + 4.694444446

Combine like terms: 3 + 4.694444446 = 7.694444446
4.694444446 + -4.333333333x + x2 = 7.694444446

Factor a perfect square on the left side:
(x + -2.166666667)(x + -2.166666667) = 7.694444446

Calculate the square root of the right side: 2.773886163

Break this problem into two subproblems by setting 
(x + -2.166666667) equal to 2.773886163 and -2.773886163.


Subproblem 1
x + -2.166666667 = 2.773886163

Simplifying
x + -2.166666667 = 2.773886163

Reorder the terms:
-2.166666667 + x = 2.773886163

Solving
-2.166666667 + x = 2.773886163

Solving for variable 'x'.

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

Add '2.166666667' to each side of the equation.
-2.166666667 + 2.166666667 + x = 2.773886163 + 2.166666667

Combine like terms: -2.166666667 + 2.166666667 = 0.000000000
0.000000000 + x = 2.773886163 + 2.166666667
x = 2.773886163 + 2.166666667

Combine like terms: 2.773886163 + 2.166666667 = 4.94055283
x = 4.94055283

Simplifying
x = 4.94055283


Subproblem 2
x + -2.166666667 = -2.773886163

Simplifying
x + -2.166666667 = -2.773886163

Reorder the terms:
-2.166666667 + x = -2.773886163

Solving
-2.166666667 + x = -2.773886163

Solving for variable 'x'.

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

Add '2.166666667' to each side of the equation.
-2.166666667 + 2.166666667 + x = -2.773886163 + 2.166666667

Combine like terms: -2.166666667 + 2.166666667 = 0.000000000
0.000000000 + x = -2.773886163 + 2.166666667
x = -2.773886163 + 2.166666667

Combine like terms: -2.773886163 + 2.166666667 = -0.607219496
x = -0.607219496

Simplifying
x = -0.607219496


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.94055283, -0.607219496}

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