x^2-.1x-.2=0

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Solution for x^2-.1x-.2=0 equation:


Simplifying
x2 + -0.1x + -0.2 = 0

Reorder the terms:
-0.2 + -0.1x + x2 = 0

Solving
-0.2 + -0.1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.1x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.1x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.1x + x2 = 0 + 0.2
-0.1x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.1x + x2 = 0.2

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 = 0.2 + 0.0025

Reorder the terms:
0.0025 + -0.1x + x2 = 0.2 + 0.0025

Combine like terms: 0.2 + 0.0025 = 0.2025
0.0025 + -0.1x + x2 = 0.2025

Factor a perfect square on the left side:
(x + -0.05)(x + -0.05) = 0.2025

Calculate the square root of the right side: 0.45

Break this problem into two subproblems by setting 
(x + -0.05) equal to 0.45 and -0.45.

Subproblem 1

x + -0.05 = 0.45 Simplifying x + -0.05 = 0.45 Reorder the terms: -0.05 + x = 0.45 Solving -0.05 + x = 0.45 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 = 0.45 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = 0.45 + 0.05 x = 0.45 + 0.05 Combine like terms: 0.45 + 0.05 = 0.5 x = 0.5 Simplifying x = 0.5

Subproblem 2

x + -0.05 = -0.45 Simplifying x + -0.05 = -0.45 Reorder the terms: -0.05 + x = -0.45 Solving -0.05 + x = -0.45 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 = -0.45 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = -0.45 + 0.05 x = -0.45 + 0.05 Combine like terms: -0.45 + 0.05 = -0.4 x = -0.4 Simplifying x = -0.4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5, -0.4}

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