3x^2+8x-116=0

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Solution for 3x^2+8x-116=0 equation: 


Simplifying
3x2 + 8x + -116 = 0

Reorder the terms:
-116 + 8x + 3x2 = 0

Solving
-116 + 8x + 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'.
-38.66666667 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '38.66666667' to each side of the equation.
-38.66666667 + 2.666666667x + 38.66666667 + x2 = 0 + 38.66666667

Reorder the terms:
-38.66666667 + 38.66666667 + 2.666666667x + x2 = 0 + 38.66666667

Combine like terms: -38.66666667 + 38.66666667 = 0.00000000
0.00000000 + 2.666666667x + x2 = 0 + 38.66666667
2.666666667x + x2 = 0 + 38.66666667

Combine like terms: 0 + 38.66666667 = 38.66666667
2.666666667x + x2 = 38.66666667

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 38.66666667 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 38.66666667 + 1.777777780

Combine like terms: 38.66666667 + 1.777777780 = 40.44444445
1.777777780 + 2.666666667x + x2 = 40.44444445

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 40.44444445

Calculate the square root of the right side: 6.359594677

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 6.359594677 and -6.359594677.


Subproblem 1
x + 1.333333334 = 6.359594677

Simplifying
x + 1.333333334 = 6.359594677

Reorder the terms:
1.333333334 + x = 6.359594677

Solving
1.333333334 + x = 6.359594677

Solving for variable 'x'.

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

Add '-1.333333334' to each side of the equation.
1.333333334 + -1.333333334 + x = 6.359594677 + -1.333333334

Combine like terms: 1.333333334 + -1.333333334 = 0.000000000
0.000000000 + x = 6.359594677 + -1.333333334
x = 6.359594677 + -1.333333334

Combine like terms: 6.359594677 + -1.333333334 = 5.026261343
x = 5.026261343

Simplifying
x = 5.026261343


Subproblem 2
x + 1.333333334 = -6.359594677

Simplifying
x + 1.333333334 = -6.359594677

Reorder the terms:
1.333333334 + x = -6.359594677

Solving
1.333333334 + x = -6.359594677

Solving for variable 'x'.

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

Add '-1.333333334' to each side of the equation.
1.333333334 + -1.333333334 + x = -6.359594677 + -1.333333334

Combine like terms: 1.333333334 + -1.333333334 = 0.000000000
0.000000000 + x = -6.359594677 + -1.333333334
x = -6.359594677 + -1.333333334

Combine like terms: -6.359594677 + -1.333333334 = -7.692928011
x = -7.692928011

Simplifying
x = -7.692928011


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.026261343, -7.692928011}

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