(0.20-x)=(x)(0.10+x)

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Solution for (0.20-x)=(x)(0.10+x) equation:


Simplifying
(0.20 + -1x) = (x)(0.10 + x)

Remove parenthesis around (0.20 + -1x)
0.20 + -1x = (x)(0.10 + x)
0.20 + -1x = (0.10 * x + x * x)
0.20 + -1x = (0.10x + x2)

Solving
0.20 + -1x = 0.10x + x2

Solving for variable 'x'.

Combine like terms: -1x + -0.10x = -1.1x
0.20 + -1.1x + -1x2 = 0.10x + x2 + -0.10x + -1x2

Reorder the terms:
0.20 + -1.1x + -1x2 = 0.10x + -0.10x + x2 + -1x2

Combine like terms: 0.10x + -0.10x = 0.00
0.20 + -1.1x + -1x2 = 0.00 + x2 + -1x2
0.20 + -1.1x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
0.20 + -1.1x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-0.2 + 1.1x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 1.1x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 1.1x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 1.1x + x2 = 0 + 0.2
1.1x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
1.1x + x2 = 0.2

The x term is 1.1x.  Take half its coefficient (0.55).
Square it (0.3025) and add it to both sides.

Add '0.3025' to each side of the equation.
1.1x + 0.3025 + x2 = 0.2 + 0.3025

Reorder the terms:
0.3025 + 1.1x + x2 = 0.2 + 0.3025

Combine like terms: 0.2 + 0.3025 = 0.5025
0.3025 + 1.1x + x2 = 0.5025

Factor a perfect square on the left side:
(x + 0.55)(x + 0.55) = 0.5025

Calculate the square root of the right side: 0.708872344

Break this problem into two subproblems by setting 
(x + 0.55) equal to 0.708872344 and -0.708872344.

Subproblem 1

x + 0.55 = 0.708872344 Simplifying x + 0.55 = 0.708872344 Reorder the terms: 0.55 + x = 0.708872344 Solving 0.55 + x = 0.708872344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.55' to each side of the equation. 0.55 + -0.55 + x = 0.708872344 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + x = 0.708872344 + -0.55 x = 0.708872344 + -0.55 Combine like terms: 0.708872344 + -0.55 = 0.158872344 x = 0.158872344 Simplifying x = 0.158872344

Subproblem 2

x + 0.55 = -0.708872344 Simplifying x + 0.55 = -0.708872344 Reorder the terms: 0.55 + x = -0.708872344 Solving 0.55 + x = -0.708872344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.55' to each side of the equation. 0.55 + -0.55 + x = -0.708872344 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + x = -0.708872344 + -0.55 x = -0.708872344 + -0.55 Combine like terms: -0.708872344 + -0.55 = -1.258872344 x = -1.258872344 Simplifying x = -1.258872344

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.158872344, -1.258872344}

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