3x^2-28x+15=0

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Solution for 3x^2-28x+15=0 equation: 


Simplifying
3x2 + -28x + 15 = 0

Reorder the terms:
15 + -28x + 3x2 = 0

Solving
15 + -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'.
5 + -9.333333333x + x2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -9.333333333x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + -9.333333333x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -9.333333333x + x2 = 0 + -5
-9.333333333x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
-9.333333333x + x2 = -5

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 = -5 + 21.77777778

Reorder the terms:
21.77777778 + -9.333333333x + x2 = -5 + 21.77777778

Combine like terms: -5 + 21.77777778 = 16.77777778
21.77777778 + -9.333333333x + x2 = 16.77777778

Factor a perfect square on the left side:
(x + -4.666666667)(x + -4.666666667) = 16.77777778

Calculate the square root of the right side: 4.096068576

Break this problem into two subproblems by setting 
(x + -4.666666667) equal to 4.096068576 and -4.096068576.


Subproblem 1
x + -4.666666667 = 4.096068576

Simplifying
x + -4.666666667 = 4.096068576

Reorder the terms:
-4.666666667 + x = 4.096068576

Solving
-4.666666667 + x = 4.096068576

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 = 4.096068576 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + x = 4.096068576 + 4.666666667
x = 4.096068576 + 4.666666667

Combine like terms: 4.096068576 + 4.666666667 = 8.762735243
x = 8.762735243

Simplifying
x = 8.762735243


Subproblem 2
x + -4.666666667 = -4.096068576

Simplifying
x + -4.666666667 = -4.096068576

Reorder the terms:
-4.666666667 + x = -4.096068576

Solving
-4.666666667 + x = -4.096068576

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 = -4.096068576 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + x = -4.096068576 + 4.666666667
x = -4.096068576 + 4.666666667

Combine like terms: -4.096068576 + 4.666666667 = 0.570598091
x = 0.570598091

Simplifying
x = 0.570598091


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {8.762735243, 0.570598091}

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