0.80x+.05x(18-x)=.10(-36)

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Solution for 0.80x+.05x(18-x)=.10(-36) equation:


Simplifying
0.80x + 0.05x(18 + -1x) = 0.10(-36)
0.80x + (18 * 0.05x + -1x * 0.05x) = 0.10(-36)
0.80x + (0.9x + -0.05x2) = 0.10(-36)

Combine like terms: 0.80x + 0.9x = 1.7x
1.7x + -0.05x2 = 0.10(-36)

Multiply 0.10 * -36
1.7x + -0.05x2 = -3.6

Solving
1.7x + -0.05x2 = -3.6

Solving for variable 'x'.

Reorder the terms:
3.6 + 1.7x + -0.05x2 = -3.6 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
3.6 + 1.7x + -0.05x2 = 0.0

Begin completing the square.  Divide all terms by
-0.05 the coefficient of the squared term: 

Divide each side by '-0.05'.
-72 + -34x + x2 = 0

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + -34x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + -34x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -34x + x2 = 0 + 72
-34x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
-34x + x2 = 72

The x term is -34x.  Take half its coefficient (-17).
Square it (289) and add it to both sides.

Add '289' to each side of the equation.
-34x + 289 + x2 = 72 + 289

Reorder the terms:
289 + -34x + x2 = 72 + 289

Combine like terms: 72 + 289 = 361
289 + -34x + x2 = 361

Factor a perfect square on the left side:
(x + -17)(x + -17) = 361

Calculate the square root of the right side: 19

Break this problem into two subproblems by setting 
(x + -17) equal to 19 and -19.

Subproblem 1

x + -17 = 19 Simplifying x + -17 = 19 Reorder the terms: -17 + x = 19 Solving -17 + x = 19 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '17' to each side of the equation. -17 + 17 + x = 19 + 17 Combine like terms: -17 + 17 = 0 0 + x = 19 + 17 x = 19 + 17 Combine like terms: 19 + 17 = 36 x = 36 Simplifying x = 36

Subproblem 2

x + -17 = -19 Simplifying x + -17 = -19 Reorder the terms: -17 + x = -19 Solving -17 + x = -19 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '17' to each side of the equation. -17 + 17 + x = -19 + 17 Combine like terms: -17 + 17 = 0 0 + x = -19 + 17 x = -19 + 17 Combine like terms: -19 + 17 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {36, -2}

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