(0.1-x)(0.2-x)=1

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Solution for (0.1-x)(0.2-x)=1 equation:


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

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

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

Solving
0.02 + -0.3x + 1x2 = 1

Solving for variable 'x'.

Reorder the terms:
0.02 + -1 + -0.3x + 1x2 = 1 + -1

Combine like terms: 0.02 + -1 = -0.98
-0.98 + -0.3x + 1x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-0.98 + -0.3x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '0.98' to each side of the equation.
-0.98 + -0.3x + 0.98 + x2 = 0 + 0.98

Reorder the terms:
-0.98 + 0.98 + -0.3x + x2 = 0 + 0.98

Combine like terms: -0.98 + 0.98 = 0.00
0.00 + -0.3x + x2 = 0 + 0.98
-0.3x + x2 = 0 + 0.98

Combine like terms: 0 + 0.98 = 0.98
-0.3x + x2 = 0.98

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 = 0.98 + 0.0225

Reorder the terms:
0.0225 + -0.3x + x2 = 0.98 + 0.0225

Combine like terms: 0.98 + 0.0225 = 1.0025
0.0225 + -0.3x + x2 = 1.0025

Factor a perfect square on the left side:
(x + -0.15)(x + -0.15) = 1.0025

Calculate the square root of the right side: 1.00124922

Break this problem into two subproblems by setting 
(x + -0.15) equal to 1.00124922 and -1.00124922.

Subproblem 1

x + -0.15 = 1.00124922 Simplifying x + -0.15 = 1.00124922 Reorder the terms: -0.15 + x = 1.00124922 Solving -0.15 + x = 1.00124922 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 = 1.00124922 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = 1.00124922 + 0.15 x = 1.00124922 + 0.15 Combine like terms: 1.00124922 + 0.15 = 1.15124922 x = 1.15124922 Simplifying x = 1.15124922

Subproblem 2

x + -0.15 = -1.00124922 Simplifying x + -0.15 = -1.00124922 Reorder the terms: -0.15 + x = -1.00124922 Solving -0.15 + x = -1.00124922 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 = -1.00124922 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = -1.00124922 + 0.15 x = -1.00124922 + 0.15 Combine like terms: -1.00124922 + 0.15 = -0.85124922 x = -0.85124922 Simplifying x = -0.85124922

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.15124922, -0.85124922}

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