3x^2+28x-240=0

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Solution for 3x^2+28x-240=0 equation: 


Simplifying
3x2 + 28x + -240 = 0

Reorder the terms:
-240 + 28x + 3x2 = 0

Solving
-240 + 28x + 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'.
-80 + 9.333333333x + x2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 9.333333333x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + 9.333333333x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 9.333333333x + x2 = 0 + 80
9.333333333x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
9.333333333x + x2 = 80

The x term is 9.333333333x.  Take half its coefficient (4.666666667).
Square it (21.77777778) and add it to both sides.

Add '21.77777778' to each side of the equation.
9.333333333x + 21.77777778 + x2 = 80 + 21.77777778

Reorder the terms:
21.77777778 + 9.333333333x + x2 = 80 + 21.77777778

Combine like terms: 80 + 21.77777778 = 101.77777778
21.77777778 + 9.333333333x + x2 = 101.77777778

Factor a perfect square on the left side:
(x + 4.666666667)(x + 4.666666667) = 101.77777778

Calculate the square root of the right side: 10.0884973

Break this problem into two subproblems by setting 
(x + 4.666666667) equal to 10.0884973 and -10.0884973.


Subproblem 1
x + 4.666666667 = 10.0884973

Simplifying
x + 4.666666667 = 10.0884973

Reorder the terms:
4.666666667 + x = 10.0884973

Solving
4.666666667 + x = 10.0884973

Solving for variable 'x'.

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

Add '-4.666666667' to each side of the equation.
4.666666667 + -4.666666667 + x = 10.0884973 + -4.666666667

Combine like terms: 4.666666667 + -4.666666667 = 0.000000000
0.000000000 + x = 10.0884973 + -4.666666667
x = 10.0884973 + -4.666666667

Combine like terms: 10.0884973 + -4.666666667 = 5.421830633
x = 5.421830633

Simplifying
x = 5.421830633


Subproblem 2
x + 4.666666667 = -10.0884973

Simplifying
x + 4.666666667 = -10.0884973

Reorder the terms:
4.666666667 + x = -10.0884973

Solving
4.666666667 + x = -10.0884973

Solving for variable 'x'.

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

Add '-4.666666667' to each side of the equation.
4.666666667 + -4.666666667 + x = -10.0884973 + -4.666666667

Combine like terms: 4.666666667 + -4.666666667 = 0.000000000
0.000000000 + x = -10.0884973 + -4.666666667
x = -10.0884973 + -4.666666667

Combine like terms: -10.0884973 + -4.666666667 = -14.755163967
x = -14.755163967

Simplifying
x = -14.755163967


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.421830633, -14.755163967}

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