5x(16-x)=72

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Solution for 5x(16-x)=72 equation:


Simplifying
5x(16 + -1x) = 72
(16 * 5x + -1x * 5x) = 72
(80x + -5x2) = 72

Solving
80x + -5x2 = 72

Solving for variable 'x'.

Reorder the terms:
-72 + 80x + -5x2 = 72 + -72

Combine like terms: 72 + -72 = 0
-72 + 80x + -5x2 = 0

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

Divide each side by '-5'.
14.4 + -16x + x2 = 0

Move the constant term to the right:

Add '-14.4' to each side of the equation.
14.4 + -16x + -14.4 + x2 = 0 + -14.4

Reorder the terms:
14.4 + -14.4 + -16x + x2 = 0 + -14.4

Combine like terms: 14.4 + -14.4 = 0.0
0.0 + -16x + x2 = 0 + -14.4
-16x + x2 = 0 + -14.4

Combine like terms: 0 + -14.4 = -14.4
-16x + x2 = -14.4

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = -14.4 + 64

Reorder the terms:
64 + -16x + x2 = -14.4 + 64

Combine like terms: -14.4 + 64 = 49.6
64 + -16x + x2 = 49.6

Factor a perfect square on the left side:
(x + -8)(x + -8) = 49.6

Calculate the square root of the right side: 7.042726745

Break this problem into two subproblems by setting 
(x + -8) equal to 7.042726745 and -7.042726745.

Subproblem 1

x + -8 = 7.042726745 Simplifying x + -8 = 7.042726745 Reorder the terms: -8 + x = 7.042726745 Solving -8 + x = 7.042726745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 7.042726745 + 8 Combine like terms: -8 + 8 = 0 0 + x = 7.042726745 + 8 x = 7.042726745 + 8 Combine like terms: 7.042726745 + 8 = 15.042726745 x = 15.042726745 Simplifying x = 15.042726745

Subproblem 2

x + -8 = -7.042726745 Simplifying x + -8 = -7.042726745 Reorder the terms: -8 + x = -7.042726745 Solving -8 + x = -7.042726745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -7.042726745 + 8 Combine like terms: -8 + 8 = 0 0 + x = -7.042726745 + 8 x = -7.042726745 + 8 Combine like terms: -7.042726745 + 8 = 0.957273255 x = 0.957273255 Simplifying x = 0.957273255

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.042726745, 0.957273255}

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