2x^2-.2x-.01=0

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Solution for 2x^2-.2x-.01=0 equation:


Simplifying
2x2 + -0.2x + -0.01 = 0

Reorder the terms:
-0.01 + -0.2x + 2x2 = 0

Solving
-0.01 + -0.2x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-0.005 + -0.1x + x2 = 0

Move the constant term to the right:

Add '0.005' to each side of the equation.
-0.005 + -0.1x + 0.005 + x2 = 0 + 0.005

Reorder the terms:
-0.005 + 0.005 + -0.1x + x2 = 0 + 0.005

Combine like terms: -0.005 + 0.005 = 0.000
0.000 + -0.1x + x2 = 0 + 0.005
-0.1x + x2 = 0 + 0.005

Combine like terms: 0 + 0.005 = 0.005
-0.1x + x2 = 0.005

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 = 0.005 + 0.0025

Reorder the terms:
0.0025 + -0.1x + x2 = 0.005 + 0.0025

Combine like terms: 0.005 + 0.0025 = 0.0075
0.0025 + -0.1x + x2 = 0.0075

Factor a perfect square on the left side:
(x + -0.05)(x + -0.05) = 0.0075

Calculate the square root of the right side: 0.08660254

Break this problem into two subproblems by setting 
(x + -0.05) equal to 0.08660254 and -0.08660254.

Subproblem 1

x + -0.05 = 0.08660254 Simplifying x + -0.05 = 0.08660254 Reorder the terms: -0.05 + x = 0.08660254 Solving -0.05 + x = 0.08660254 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 = 0.08660254 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = 0.08660254 + 0.05 x = 0.08660254 + 0.05 Combine like terms: 0.08660254 + 0.05 = 0.13660254 x = 0.13660254 Simplifying x = 0.13660254

Subproblem 2

x + -0.05 = -0.08660254 Simplifying x + -0.05 = -0.08660254 Reorder the terms: -0.05 + x = -0.08660254 Solving -0.05 + x = -0.08660254 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 = -0.08660254 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = -0.08660254 + 0.05 x = -0.08660254 + 0.05 Combine like terms: -0.08660254 + 0.05 = -0.03660254 x = -0.03660254 Simplifying x = -0.03660254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.13660254, -0.03660254}

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