3x^2-13x-155=0

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Solution for 3x^2-13x-155=0 equation: 


Simplifying
3x2 + -13x + -155 = 0

Reorder the terms:
-155 + -13x + 3x2 = 0

Solving
-155 + -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'.
-51.66666667 + -4.333333333x + x2 = 0

Move the constant term to the right:

Add '51.66666667' to each side of the equation.
-51.66666667 + -4.333333333x + 51.66666667 + x2 = 0 + 51.66666667

Reorder the terms:
-51.66666667 + 51.66666667 + -4.333333333x + x2 = 0 + 51.66666667

Combine like terms: -51.66666667 + 51.66666667 = 0.00000000
0.00000000 + -4.333333333x + x2 = 0 + 51.66666667
-4.333333333x + x2 = 0 + 51.66666667

Combine like terms: 0 + 51.66666667 = 51.66666667
-4.333333333x + x2 = 51.66666667

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 = 51.66666667 + 4.694444446

Reorder the terms:
4.694444446 + -4.333333333x + x2 = 51.66666667 + 4.694444446

Combine like terms: 51.66666667 + 4.694444446 = 56.361111116
4.694444446 + -4.333333333x + x2 = 56.361111116

Factor a perfect square on the left side:
(x + -2.166666667)(x + -2.166666667) = 56.361111116

Calculate the square root of the right side: 7.507403753

Break this problem into two subproblems by setting 
(x + -2.166666667) equal to 7.507403753 and -7.507403753.


Subproblem 1
x + -2.166666667 = 7.507403753

Simplifying
x + -2.166666667 = 7.507403753

Reorder the terms:
-2.166666667 + x = 7.507403753

Solving
-2.166666667 + x = 7.507403753

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 = 7.507403753 + 2.166666667

Combine like terms: -2.166666667 + 2.166666667 = 0.000000000
0.000000000 + x = 7.507403753 + 2.166666667
x = 7.507403753 + 2.166666667

Combine like terms: 7.507403753 + 2.166666667 = 9.67407042
x = 9.67407042

Simplifying
x = 9.67407042


Subproblem 2
x + -2.166666667 = -7.507403753

Simplifying
x + -2.166666667 = -7.507403753

Reorder the terms:
-2.166666667 + x = -7.507403753

Solving
-2.166666667 + x = -7.507403753

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 = -7.507403753 + 2.166666667

Combine like terms: -2.166666667 + 2.166666667 = 0.000000000
0.000000000 + x = -7.507403753 + 2.166666667
x = -7.507403753 + 2.166666667

Combine like terms: -7.507403753 + 2.166666667 = -5.340737086
x = -5.340737086

Simplifying
x = -5.340737086


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {9.67407042, -5.340737086}

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