3x^2+16x-135=0

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Solution for 3x^2+16x-135=0 equation: 


Simplifying
3x2 + 16x + -135 = 0

Reorder the terms:
-135 + 16x + 3x2 = 0

Solving
-135 + 16x + 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'.
-45 + 5.333333333x + x2 = 0

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + 5.333333333x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + 5.333333333x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 5.333333333x + x2 = 0 + 45
5.333333333x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
5.333333333x + x2 = 45

The x term is 5.333333333x.  Take half its coefficient (2.666666667).
Square it (7.111111113) and add it to both sides.

Add '7.111111113' to each side of the equation.
5.333333333x + 7.111111113 + x2 = 45 + 7.111111113

Reorder the terms:
7.111111113 + 5.333333333x + x2 = 45 + 7.111111113

Combine like terms: 45 + 7.111111113 = 52.111111113
7.111111113 + 5.333333333x + x2 = 52.111111113

Factor a perfect square on the left side:
(x + 2.666666667)(x + 2.666666667) = 52.111111113

Calculate the square root of the right side: 7.218802609

Break this problem into two subproblems by setting 
(x + 2.666666667) equal to 7.218802609 and -7.218802609.


Subproblem 1
x + 2.666666667 = 7.218802609

Simplifying
x + 2.666666667 = 7.218802609

Reorder the terms:
2.666666667 + x = 7.218802609

Solving
2.666666667 + x = 7.218802609

Solving for variable 'x'.

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

Add '-2.666666667' to each side of the equation.
2.666666667 + -2.666666667 + x = 7.218802609 + -2.666666667

Combine like terms: 2.666666667 + -2.666666667 = 0.000000000
0.000000000 + x = 7.218802609 + -2.666666667
x = 7.218802609 + -2.666666667

Combine like terms: 7.218802609 + -2.666666667 = 4.552135942
x = 4.552135942

Simplifying
x = 4.552135942


Subproblem 2
x + 2.666666667 = -7.218802609

Simplifying
x + 2.666666667 = -7.218802609

Reorder the terms:
2.666666667 + x = -7.218802609

Solving
2.666666667 + x = -7.218802609

Solving for variable 'x'.

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

Add '-2.666666667' to each side of the equation.
2.666666667 + -2.666666667 + x = -7.218802609 + -2.666666667

Combine like terms: 2.666666667 + -2.666666667 = 0.000000000
0.000000000 + x = -7.218802609 + -2.666666667
x = -7.218802609 + -2.666666667

Combine like terms: -7.218802609 + -2.666666667 = -9.885469276
x = -9.885469276

Simplifying
x = -9.885469276


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.552135942, -9.885469276}

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