12=5x(4-x)

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Solution for 12=5x(4-x) equation:


Simplifying
12 = 5x(4 + -1x)
12 = (4 * 5x + -1x * 5x)
12 = (20x + -5x2)

Solving
12 = 20x + -5x2

Solving for variable 'x'.

Reorder the terms:
12 + -20x + 5x2 = 20x + -20x + -5x2 + 5x2

Combine like terms: 20x + -20x = 0
12 + -20x + 5x2 = 0 + -5x2 + 5x2
12 + -20x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
12 + -20x + 5x2 = 0

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

Divide each side by '5'.
2.4 + -4x + x2 = 0

Move the constant term to the right:

Add '-2.4' to each side of the equation.
2.4 + -4x + -2.4 + x2 = 0 + -2.4

Reorder the terms:
2.4 + -2.4 + -4x + x2 = 0 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + -4x + x2 = 0 + -2.4
-4x + x2 = 0 + -2.4

Combine like terms: 0 + -2.4 = -2.4
-4x + x2 = -2.4

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = -2.4 + 4

Reorder the terms:
4 + -4x + x2 = -2.4 + 4

Combine like terms: -2.4 + 4 = 1.6
4 + -4x + x2 = 1.6

Factor a perfect square on the left side:
(x + -2)(x + -2) = 1.6

Calculate the square root of the right side: 1.264911064

Break this problem into two subproblems by setting 
(x + -2) equal to 1.264911064 and -1.264911064.

Subproblem 1

x + -2 = 1.264911064 Simplifying x + -2 = 1.264911064 Reorder the terms: -2 + x = 1.264911064 Solving -2 + x = 1.264911064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 1.264911064 + 2 Combine like terms: -2 + 2 = 0 0 + x = 1.264911064 + 2 x = 1.264911064 + 2 Combine like terms: 1.264911064 + 2 = 3.264911064 x = 3.264911064 Simplifying x = 3.264911064

Subproblem 2

x + -2 = -1.264911064 Simplifying x + -2 = -1.264911064 Reorder the terms: -2 + x = -1.264911064 Solving -2 + x = -1.264911064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -1.264911064 + 2 Combine like terms: -2 + 2 = 0 0 + x = -1.264911064 + 2 x = -1.264911064 + 2 Combine like terms: -1.264911064 + 2 = 0.735088936 x = 0.735088936 Simplifying x = 0.735088936

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.264911064, 0.735088936}

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