.5x+.5x(16-x)=.10(-73)

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Solution for .5x+.5x(16-x)=.10(-73) equation:


Simplifying
0.5x + 0.5x(16 + -1x) = 0.10(-73)
0.5x + (16 * 0.5x + -1x * 0.5x) = 0.10(-73)
0.5x + (8x + -0.5x2) = 0.10(-73)

Combine like terms: 0.5x + 8x = 8.5x
8.5x + -0.5x2 = 0.10(-73)

Multiply 0.10 * -73
8.5x + -0.5x2 = -7.3

Solving
8.5x + -0.5x2 = -7.3

Solving for variable 'x'.

Reorder the terms:
7.3 + 8.5x + -0.5x2 = -7.3 + 7.3

Combine like terms: -7.3 + 7.3 = 0.0
7.3 + 8.5x + -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'.
-14.6 + -17x + x2 = 0

Move the constant term to the right:

Add '14.6' to each side of the equation.
-14.6 + -17x + 14.6 + x2 = 0 + 14.6

Reorder the terms:
-14.6 + 14.6 + -17x + x2 = 0 + 14.6

Combine like terms: -14.6 + 14.6 = 0.0
0.0 + -17x + x2 = 0 + 14.6
-17x + x2 = 0 + 14.6

Combine like terms: 0 + 14.6 = 14.6
-17x + x2 = 14.6

The x term is -17x.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17x + 72.25 + x2 = 14.6 + 72.25

Reorder the terms:
72.25 + -17x + x2 = 14.6 + 72.25

Combine like terms: 14.6 + 72.25 = 86.85
72.25 + -17x + x2 = 86.85

Factor a perfect square on the left side:
(x + -8.5)(x + -8.5) = 86.85

Calculate the square root of the right side: 9.31933474

Break this problem into two subproblems by setting 
(x + -8.5) equal to 9.31933474 and -9.31933474.

Subproblem 1

x + -8.5 = 9.31933474 Simplifying x + -8.5 = 9.31933474 Reorder the terms: -8.5 + x = 9.31933474 Solving -8.5 + x = 9.31933474 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = 9.31933474 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = 9.31933474 + 8.5 x = 9.31933474 + 8.5 Combine like terms: 9.31933474 + 8.5 = 17.81933474 x = 17.81933474 Simplifying x = 17.81933474

Subproblem 2

x + -8.5 = -9.31933474 Simplifying x + -8.5 = -9.31933474 Reorder the terms: -8.5 + x = -9.31933474 Solving -8.5 + x = -9.31933474 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = -9.31933474 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = -9.31933474 + 8.5 x = -9.31933474 + 8.5 Combine like terms: -9.31933474 + 8.5 = -0.81933474 x = -0.81933474 Simplifying x = -0.81933474

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.81933474, -0.81933474}

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