-0.2x^2+0.1x=-0.02

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Solution for -0.2x^2+0.1x=-0.02 equation:


Simplifying
-0.2x2 + 0.1x = -0.02

Reorder the terms:
0.1x + -0.2x2 = -0.02

Solving
0.1x + -0.2x2 = -0.02

Solving for variable 'x'.

Reorder the terms:
0.02 + 0.1x + -0.2x2 = -0.02 + 0.02

Combine like terms: -0.02 + 0.02 = 0.00
0.02 + 0.1x + -0.2x2 = 0.00

Begin completing the square.  Divide all terms by
-0.2 the coefficient of the squared term: 

Divide each side by '-0.2'.
-0.1 + -0.5x + x2 = 0.0

Move the constant term to the right:

Add '0.1' to each side of the equation.
-0.1 + -0.5x + 0.1 + x2 = 0.0 + 0.1

Reorder the terms:
-0.1 + 0.1 + -0.5x + x2 = 0.0 + 0.1

Combine like terms: -0.1 + 0.1 = 0.0
0.0 + -0.5x + x2 = 0.0 + 0.1
-0.5x + x2 = 0.0 + 0.1

Combine like terms: 0.0 + 0.1 = 0.1
-0.5x + x2 = 0.1

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 0.1 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 0.1 + 0.0625

Combine like terms: 0.1 + 0.0625 = 0.1625
0.0625 + -0.5x + x2 = 0.1625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 0.1625

Calculate the square root of the right side: 0.403112887

Break this problem into two subproblems by setting 
(x + -0.25) equal to 0.403112887 and -0.403112887.

Subproblem 1

x + -0.25 = 0.403112887 Simplifying x + -0.25 = 0.403112887 Reorder the terms: -0.25 + x = 0.403112887 Solving -0.25 + x = 0.403112887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 0.403112887 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 0.403112887 + 0.25 x = 0.403112887 + 0.25 Combine like terms: 0.403112887 + 0.25 = 0.653112887 x = 0.653112887 Simplifying x = 0.653112887

Subproblem 2

x + -0.25 = -0.403112887 Simplifying x + -0.25 = -0.403112887 Reorder the terms: -0.25 + x = -0.403112887 Solving -0.25 + x = -0.403112887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -0.403112887 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -0.403112887 + 0.25 x = -0.403112887 + 0.25 Combine like terms: -0.403112887 + 0.25 = -0.153112887 x = -0.153112887 Simplifying x = -0.153112887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.653112887, -0.153112887}

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