.5x(18-x)=5.2

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Solution for .5x(18-x)=5.2 equation:


Simplifying
0.5x(18 + -1x) = 5.2
(18 * 0.5x + -1x * 0.5x) = 5.2
(9x + -0.5x2) = 5.2

Solving
9x + -0.5x2 = 5.2

Solving for variable 'x'.

Reorder the terms:
-5.2 + 9x + -0.5x2 = 5.2 + -5.2

Combine like terms: 5.2 + -5.2 = 0.0
-5.2 + 9x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
10.4 + -18x + x2 = 0

Move the constant term to the right:

Add '-10.4' to each side of the equation.
10.4 + -18x + -10.4 + x2 = 0 + -10.4

Reorder the terms:
10.4 + -10.4 + -18x + x2 = 0 + -10.4

Combine like terms: 10.4 + -10.4 = 0.0
0.0 + -18x + x2 = 0 + -10.4
-18x + x2 = 0 + -10.4

Combine like terms: 0 + -10.4 = -10.4
-18x + x2 = -10.4

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = -10.4 + 81

Reorder the terms:
81 + -18x + x2 = -10.4 + 81

Combine like terms: -10.4 + 81 = 70.6
81 + -18x + x2 = 70.6

Factor a perfect square on the left side:
(x + -9)(x + -9) = 70.6

Calculate the square root of the right side: 8.402380615

Break this problem into two subproblems by setting 
(x + -9) equal to 8.402380615 and -8.402380615.

Subproblem 1

x + -9 = 8.402380615 Simplifying x + -9 = 8.402380615 Reorder the terms: -9 + x = 8.402380615 Solving -9 + x = 8.402380615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 8.402380615 + 9 Combine like terms: -9 + 9 = 0 0 + x = 8.402380615 + 9 x = 8.402380615 + 9 Combine like terms: 8.402380615 + 9 = 17.402380615 x = 17.402380615 Simplifying x = 17.402380615

Subproblem 2

x + -9 = -8.402380615 Simplifying x + -9 = -8.402380615 Reorder the terms: -9 + x = -8.402380615 Solving -9 + x = -8.402380615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -8.402380615 + 9 Combine like terms: -9 + 9 = 0 0 + x = -8.402380615 + 9 x = -8.402380615 + 9 Combine like terms: -8.402380615 + 9 = 0.597619385 x = 0.597619385 Simplifying x = 0.597619385

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.402380615, 0.597619385}

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