x^2+0.1x-0.02=0

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Solution for x^2+0.1x-0.02=0 equation:


Simplifying
x2 + 0.1x + -0.02 = 0

Reorder the terms:
-0.02 + 0.1x + x2 = 0

Solving
-0.02 + 0.1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.02' to each side of the equation.
-0.02 + 0.1x + 0.02 + x2 = 0 + 0.02

Reorder the terms:
-0.02 + 0.02 + 0.1x + x2 = 0 + 0.02

Combine like terms: -0.02 + 0.02 = 0.00
0.00 + 0.1x + x2 = 0 + 0.02
0.1x + x2 = 0 + 0.02

Combine like terms: 0 + 0.02 = 0.02
0.1x + x2 = 0.02

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 = 0.02 + 0.0025

Reorder the terms:
0.0025 + 0.1x + x2 = 0.02 + 0.0025

Combine like terms: 0.02 + 0.0025 = 0.0225
0.0025 + 0.1x + x2 = 0.0225

Factor a perfect square on the left side:
(x + 0.05)(x + 0.05) = 0.0225

Calculate the square root of the right side: 0.15

Break this problem into two subproblems by setting 
(x + 0.05) equal to 0.15 and -0.15.

Subproblem 1

x + 0.05 = 0.15 Simplifying x + 0.05 = 0.15 Reorder the terms: 0.05 + x = 0.15 Solving 0.05 + x = 0.15 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 = 0.15 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + x = 0.15 + -0.05 x = 0.15 + -0.05 Combine like terms: 0.15 + -0.05 = 0.1 x = 0.1 Simplifying x = 0.1

Subproblem 2

x + 0.05 = -0.15 Simplifying x + 0.05 = -0.15 Reorder the terms: 0.05 + x = -0.15 Solving 0.05 + x = -0.15 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 = -0.15 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + x = -0.15 + -0.05 x = -0.15 + -0.05 Combine like terms: -0.15 + -0.05 = -0.2 x = -0.2 Simplifying x = -0.2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.1, -0.2}

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