3x^2-16x=15

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Solution for 3x^2-16x=15 equation: 


Simplifying
3x2 + -16x = 15

Reorder the terms:
-16x + 3x2 = 15

Solving
-16x + 3x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -16x + 3x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -16x + 3x2 = 0

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

Divide each side by '3'.
-5 + -5.333333333x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -5.333333333x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -5.333333333x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -5.333333333x + x2 = 0 + 5
-5.333333333x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-5.333333333x + x2 = 5

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 = 5 + 7.111111113

Reorder the terms:
7.111111113 + -5.333333333x + x2 = 5 + 7.111111113

Combine like terms: 5 + 7.111111113 = 12.111111113
7.111111113 + -5.333333333x + x2 = 12.111111113

Factor a perfect square on the left side:
(x + -2.666666667)(x + -2.666666667) = 12.111111113

Calculate the square root of the right side: 3.48010217

Break this problem into two subproblems by setting 
(x + -2.666666667) equal to 3.48010217 and -3.48010217.


Subproblem 1
x + -2.666666667 = 3.48010217

Simplifying
x + -2.666666667 = 3.48010217

Reorder the terms:
-2.666666667 + x = 3.48010217

Solving
-2.666666667 + x = 3.48010217

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 = 3.48010217 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + x = 3.48010217 + 2.666666667
x = 3.48010217 + 2.666666667

Combine like terms: 3.48010217 + 2.666666667 = 6.146768837
x = 6.146768837

Simplifying
x = 6.146768837


Subproblem 2
x + -2.666666667 = -3.48010217

Simplifying
x + -2.666666667 = -3.48010217

Reorder the terms:
-2.666666667 + x = -3.48010217

Solving
-2.666666667 + x = -3.48010217

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 = -3.48010217 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + x = -3.48010217 + 2.666666667
x = -3.48010217 + 2.666666667

Combine like terms: -3.48010217 + 2.666666667 = -0.813435503
x = -0.813435503

Simplifying
x = -0.813435503


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {6.146768837, -0.813435503}

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