(8-0.2X)(6-0.1X)=0

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Solution for (8-0.2X)(6-0.1X)=0 equation:


Simplifying
(8 + -0.2X)(6 + -0.1X) = 0

Multiply (8 + -0.2X) * (6 + -0.1X)
(8(6 + -0.1X) + -0.2X * (6 + -0.1X)) = 0
((6 * 8 + -0.1X * 8) + -0.2X * (6 + -0.1X)) = 0
((48 + -0.8X) + -0.2X * (6 + -0.1X)) = 0
(48 + -0.8X + (6 * -0.2X + -0.1X * -0.2X)) = 0
(48 + -0.8X + (-1.2X + 0.02X2)) = 0

Combine like terms: -0.8X + -1.2X = -2X
(48 + -2X + 0.02X2) = 0

Solving
48 + -2X + 0.02X2 = 0

Solving for variable 'X'.

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

Divide each side by '0.02'.
2400 + -100X + X2 = 0

Move the constant term to the right:

Add '-2400' to each side of the equation.
2400 + -100X + -2400 + X2 = 0 + -2400

Reorder the terms:
2400 + -2400 + -100X + X2 = 0 + -2400

Combine like terms: 2400 + -2400 = 0
0 + -100X + X2 = 0 + -2400
-100X + X2 = 0 + -2400

Combine like terms: 0 + -2400 = -2400
-100X + X2 = -2400

The X term is -100X.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100X + 2500 + X2 = -2400 + 2500

Reorder the terms:
2500 + -100X + X2 = -2400 + 2500

Combine like terms: -2400 + 2500 = 100
2500 + -100X + X2 = 100

Factor a perfect square on the left side:
(X + -50)(X + -50) = 100

Calculate the square root of the right side: 10

Break this problem into two subproblems by setting 
(X + -50) equal to 10 and -10.

Subproblem 1

X + -50 = 10 Simplifying X + -50 = 10 Reorder the terms: -50 + X = 10 Solving -50 + X = 10 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + X = 10 + 50 Combine like terms: -50 + 50 = 0 0 + X = 10 + 50 X = 10 + 50 Combine like terms: 10 + 50 = 60 X = 60 Simplifying X = 60

Subproblem 2

X + -50 = -10 Simplifying X + -50 = -10 Reorder the terms: -50 + X = -10 Solving -50 + X = -10 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + X = -10 + 50 Combine like terms: -50 + 50 = 0 0 + X = -10 + 50 X = -10 + 50 Combine like terms: -10 + 50 = 40 X = 40 Simplifying X = 40

Solution

The solution to the problem is based on the solutions from the subproblems. X = {60, 40}

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