(.2-x)(.1-x)=

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Solution for (.2-x)(.1-x)= equation:


Simplifying
(0.2 + -1x)(0.1 + -1x) = 0

Multiply (0.2 + -1x) * (0.1 + -1x)
(0.2(0.1 + -1x) + -1x * (0.1 + -1x)) = 0
((0.1 * 0.2 + -1x * 0.2) + -1x * (0.1 + -1x)) = 0
((0.02 + -0.2x) + -1x * (0.1 + -1x)) = 0
(0.02 + -0.2x + (0.1 * -1x + -1x * -1x)) = 0
(0.02 + -0.2x + (-0.1x + 1x2)) = 0

Combine like terms: -0.2x + -0.1x = -0.3x
(0.02 + -0.3x + 1x2) = 0

Solving
0.02 + -0.3x + 1x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.02' to each side of the equation.
0.02 + -0.3x + -0.02 + x2 = 0 + -0.02

Reorder the terms:
0.02 + -0.02 + -0.3x + x2 = 0 + -0.02

Combine like terms: 0.02 + -0.02 = 0.00
0.00 + -0.3x + x2 = 0 + -0.02
-0.3x + x2 = 0 + -0.02

Combine like terms: 0 + -0.02 = -0.02
-0.3x + x2 = -0.02

The x term is -0.3x.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3x + 0.0225 + x2 = -0.02 + 0.0225

Reorder the terms:
0.0225 + -0.3x + x2 = -0.02 + 0.0225

Combine like terms: -0.02 + 0.0225 = 0.0025
0.0225 + -0.3x + x2 = 0.0025

Factor a perfect square on the left side:
(x + -0.15)(x + -0.15) = 0.0025

Calculate the square root of the right side: 0.05

Break this problem into two subproblems by setting 
(x + -0.15) equal to 0.05 and -0.05.

Subproblem 1

x + -0.15 = 0.05 Simplifying x + -0.15 = 0.05 Reorder the terms: -0.15 + x = 0.05 Solving -0.15 + x = 0.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = 0.05 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = 0.05 + 0.15 x = 0.05 + 0.15 Combine like terms: 0.05 + 0.15 = 0.2 x = 0.2 Simplifying x = 0.2

Subproblem 2

x + -0.15 = -0.05 Simplifying x + -0.15 = -0.05 Reorder the terms: -0.15 + x = -0.05 Solving -0.15 + x = -0.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = -0.05 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = -0.05 + 0.15 x = -0.05 + 0.15 Combine like terms: -0.05 + 0.15 = 0.1 x = 0.1 Simplifying x = 0.1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2, 0.1}

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