6x^2-28x-120=0

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Solution for 6x^2-28x-120=0 equation: 


Simplifying
6x2 + -28x + -120 = 0

Reorder the terms:
-120 + -28x + 6x2 = 0

Solving
-120 + -28x + 6x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-60 + -14x + 3x2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-60 + -14x + 3x2)' equal to zero and attempt to solve:

Simplifying
-60 + -14x + 3x2 = 0

Solving
-60 + -14x + 3x2 = 0

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

Divide each side by '3'.
-20 + -4.666666667x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -4.666666667x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -4.666666667x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -4.666666667x + x2 = 0 + 20
-4.666666667x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-4.666666667x + x2 = 20

The x term is -4.666666667x.  Take half its coefficient (-2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
-4.666666667x + 5.444444448 + x2 = 20 + 5.444444448

Reorder the terms:
5.444444448 + -4.666666667x + x2 = 20 + 5.444444448

Combine like terms: 20 + 5.444444448 = 25.444444448
5.444444448 + -4.666666667x + x2 = 25.444444448

Factor a perfect square on the left side:
(x + -2.333333334)(x + -2.333333334) = 25.444444448

Calculate the square root of the right side: 5.04424865

Break this problem into two subproblems by setting 
(x + -2.333333334) equal to 5.04424865 and -5.04424865.


Subproblem 1
x + -2.333333334 = 5.04424865

Simplifying
x + -2.333333334 = 5.04424865

Reorder the terms:
-2.333333334 + x = 5.04424865

Solving
-2.333333334 + x = 5.04424865

Solving for variable 'x'.

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

Add '2.333333334' to each side of the equation.
-2.333333334 + 2.333333334 + x = 5.04424865 + 2.333333334

Combine like terms: -2.333333334 + 2.333333334 = 0.000000000
0.000000000 + x = 5.04424865 + 2.333333334
x = 5.04424865 + 2.333333334

Combine like terms: 5.04424865 + 2.333333334 = 7.377581984
x = 7.377581984

Simplifying
x = 7.377581984


Subproblem 2
x + -2.333333334 = -5.04424865

Simplifying
x + -2.333333334 = -5.04424865

Reorder the terms:
-2.333333334 + x = -5.04424865

Solving
-2.333333334 + x = -5.04424865

Solving for variable 'x'.

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

Add '2.333333334' to each side of the equation.
-2.333333334 + 2.333333334 + x = -5.04424865 + 2.333333334

Combine like terms: -2.333333334 + 2.333333334 = 0.000000000
0.000000000 + x = -5.04424865 + 2.333333334
x = -5.04424865 + 2.333333334

Combine like terms: -5.04424865 + 2.333333334 = -2.710915316
x = -2.710915316

Simplifying
x = -2.710915316


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {7.377581984, -2.710915316}
Solution
x = {7.377581984, -2.710915316}

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