0.80x*.05(20-x)=.10(100)

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Solution for 0.80x*.05(20-x)=.10(100) equation:


Simplifying
0.80x * 0.05(20 + -1x) = 0.10(100)

Reorder the terms for easier multiplication:
0.80 * 0.05x(20 + -1x) = 0.10(100)

Multiply 0.80 * 0.05
0.04x(20 + -1x) = 0.10(100)
(20 * 0.04x + -1x * 0.04x) = 0.10(100)
(0.8x + -0.04x2) = 0.10(100)

Multiply 0.10 * 100
0.8x + -0.04x2 = 10

Solving
0.8x + -0.04x2 = 10

Solving for variable 'x'.

Reorder the terms:
-10 + 0.8x + -0.04x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + 0.8x + -0.04x2 = 0

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
250 + -20x + x2 = 0

Move the constant term to the right:

Add '-250' to each side of the equation.
250 + -20x + -250 + x2 = 0 + -250

Reorder the terms:
250 + -250 + -20x + x2 = 0 + -250

Combine like terms: 250 + -250 = 0
0 + -20x + x2 = 0 + -250
-20x + x2 = 0 + -250

Combine like terms: 0 + -250 = -250
-20x + x2 = -250

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = -250 + 100

Reorder the terms:
100 + -20x + x2 = -250 + 100

Combine like terms: -250 + 100 = -150
100 + -20x + x2 = -150

Factor a perfect square on the left side:
(x + -10)(x + -10) = -150

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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