5x(4-x)=9-(x-6)

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Solution for 5x(4-x)=9-(x-6) equation:


Simplifying
5x(4 + -1x) = 9 + -1(x + -6)
(4 * 5x + -1x * 5x) = 9 + -1(x + -6)
(20x + -5x2) = 9 + -1(x + -6)

Reorder the terms:
20x + -5x2 = 9 + -1(-6 + x)
20x + -5x2 = 9 + (-6 * -1 + x * -1)
20x + -5x2 = 9 + (6 + -1x)

Combine like terms: 9 + 6 = 15
20x + -5x2 = 15 + -1x

Solving
20x + -5x2 = 15 + -1x

Solving for variable 'x'.

Reorder the terms:
-15 + 20x + x + -5x2 = 15 + -1x + -15 + x

Combine like terms: 20x + x = 21x
-15 + 21x + -5x2 = 15 + -1x + -15 + x

Reorder the terms:
-15 + 21x + -5x2 = 15 + -15 + -1x + x

Combine like terms: 15 + -15 = 0
-15 + 21x + -5x2 = 0 + -1x + x
-15 + 21x + -5x2 = -1x + x

Combine like terms: -1x + x = 0
-15 + 21x + -5x2 = 0

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

Divide each side by '-5'.
3 + -4.2x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -4.2x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + -4.2x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -4.2x + x2 = 0 + -3
-4.2x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
-4.2x + x2 = -3

The x term is -4.2x.  Take half its coefficient (-2.1).
Square it (4.41) and add it to both sides.

Add '4.41' to each side of the equation.
-4.2x + 4.41 + x2 = -3 + 4.41

Reorder the terms:
4.41 + -4.2x + x2 = -3 + 4.41

Combine like terms: -3 + 4.41 = 1.41
4.41 + -4.2x + x2 = 1.41

Factor a perfect square on the left side:
(x + -2.1)(x + -2.1) = 1.41

Calculate the square root of the right side: 1.187434209

Break this problem into two subproblems by setting 
(x + -2.1) equal to 1.187434209 and -1.187434209.

Subproblem 1

x + -2.1 = 1.187434209 Simplifying x + -2.1 = 1.187434209 Reorder the terms: -2.1 + x = 1.187434209 Solving -2.1 + x = 1.187434209 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1' to each side of the equation. -2.1 + 2.1 + x = 1.187434209 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + x = 1.187434209 + 2.1 x = 1.187434209 + 2.1 Combine like terms: 1.187434209 + 2.1 = 3.287434209 x = 3.287434209 Simplifying x = 3.287434209

Subproblem 2

x + -2.1 = -1.187434209 Simplifying x + -2.1 = -1.187434209 Reorder the terms: -2.1 + x = -1.187434209 Solving -2.1 + x = -1.187434209 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1' to each side of the equation. -2.1 + 2.1 + x = -1.187434209 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + x = -1.187434209 + 2.1 x = -1.187434209 + 2.1 Combine like terms: -1.187434209 + 2.1 = 0.912565791 x = 0.912565791 Simplifying x = 0.912565791

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.287434209, 0.912565791}

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