2=x(x+0.1)

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Solution for 2=x(x+0.1) equation:


Simplifying
2 = x(x + 0.1)

Reorder the terms:
2 = x(0.1 + x)
2 = (0.1 * x + x * x)
2 = (0.1x + x2)

Solving
2 = 0.1x + x2

Solving for variable 'x'.

Reorder the terms:
2 + -0.1x + -1x2 = 0.1x + -0.1x + x2 + -1x2

Combine like terms: 0.1x + -0.1x = 0.0
2 + -0.1x + -1x2 = 0.0 + x2 + -1x2
2 + -0.1x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
2 + -0.1x + -1x2 = 0

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

Divide each side by '-1'.
-2 + 0.1x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 0.1x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 0.1x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 0.1x + x2 = 0 + 2
0.1x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
0.1x + x2 = 2

The x term is 0.1x.  Take half its coefficient (0.05).
Square it (0.0025) and add it to both sides.

Add '0.0025' to each side of the equation.
0.1x + 0.0025 + x2 = 2 + 0.0025

Reorder the terms:
0.0025 + 0.1x + x2 = 2 + 0.0025

Combine like terms: 2 + 0.0025 = 2.0025
0.0025 + 0.1x + x2 = 2.0025

Factor a perfect square on the left side:
(x + 0.05)(x + 0.05) = 2.0025

Calculate the square root of the right side: 1.41509717

Break this problem into two subproblems by setting 
(x + 0.05) equal to 1.41509717 and -1.41509717.

Subproblem 1

x + 0.05 = 1.41509717 Simplifying x + 0.05 = 1.41509717 Reorder the terms: 0.05 + x = 1.41509717 Solving 0.05 + x = 1.41509717 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05' to each side of the equation. 0.05 + -0.05 + x = 1.41509717 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + x = 1.41509717 + -0.05 x = 1.41509717 + -0.05 Combine like terms: 1.41509717 + -0.05 = 1.36509717 x = 1.36509717 Simplifying x = 1.36509717

Subproblem 2

x + 0.05 = -1.41509717 Simplifying x + 0.05 = -1.41509717 Reorder the terms: 0.05 + x = -1.41509717 Solving 0.05 + x = -1.41509717 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05' to each side of the equation. 0.05 + -0.05 + x = -1.41509717 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + x = -1.41509717 + -0.05 x = -1.41509717 + -0.05 Combine like terms: -1.41509717 + -0.05 = -1.46509717 x = -1.46509717 Simplifying x = -1.46509717

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.36509717, -1.46509717}

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