28=3x(12-x)

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Solution for 28=3x(12-x) equation:


Simplifying
28 = 3x(12 + -1x)
28 = (12 * 3x + -1x * 3x)
28 = (36x + -3x2)

Solving
28 = 36x + -3x2

Solving for variable 'x'.

Reorder the terms:
28 + -36x + 3x2 = 36x + -36x + -3x2 + 3x2

Combine like terms: 36x + -36x = 0
28 + -36x + 3x2 = 0 + -3x2 + 3x2
28 + -36x + 3x2 = -3x2 + 3x2

Combine like terms: -3x2 + 3x2 = 0
28 + -36x + 3x2 = 0

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

Divide each side by '3'.
9.333333333 + -12x + x2 = 0

Move the constant term to the right:

Add '-9.333333333' to each side of the equation.
9.333333333 + -12x + -9.333333333 + x2 = 0 + -9.333333333

Reorder the terms:
9.333333333 + -9.333333333 + -12x + x2 = 0 + -9.333333333

Combine like terms: 9.333333333 + -9.333333333 = 0.000000000
0.000000000 + -12x + x2 = 0 + -9.333333333
-12x + x2 = 0 + -9.333333333

Combine like terms: 0 + -9.333333333 = -9.333333333
-12x + x2 = -9.333333333

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -9.333333333 + 36

Reorder the terms:
36 + -12x + x2 = -9.333333333 + 36

Combine like terms: -9.333333333 + 36 = 26.666666667
36 + -12x + x2 = 26.666666667

Factor a perfect square on the left side:
(x + -6)(x + -6) = 26.666666667

Calculate the square root of the right side: 5.163977795

Break this problem into two subproblems by setting 
(x + -6) equal to 5.163977795 and -5.163977795.

Subproblem 1

x + -6 = 5.163977795 Simplifying x + -6 = 5.163977795 Reorder the terms: -6 + x = 5.163977795 Solving -6 + x = 5.163977795 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 5.163977795 + 6 Combine like terms: -6 + 6 = 0 0 + x = 5.163977795 + 6 x = 5.163977795 + 6 Combine like terms: 5.163977795 + 6 = 11.163977795 x = 11.163977795 Simplifying x = 11.163977795

Subproblem 2

x + -6 = -5.163977795 Simplifying x + -6 = -5.163977795 Reorder the terms: -6 + x = -5.163977795 Solving -6 + x = -5.163977795 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -5.163977795 + 6 Combine like terms: -6 + 6 = 0 0 + x = -5.163977795 + 6 x = -5.163977795 + 6 Combine like terms: -5.163977795 + 6 = 0.836022205 x = 0.836022205 Simplifying x = 0.836022205

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.163977795, 0.836022205}

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