x^2+0.2x-0.25=0

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Solution for x^2+0.2x-0.25=0 equation:


Simplifying
x2 + 0.2x + -0.25 = 0

Reorder the terms:
-0.25 + 0.2x + x2 = 0

Solving
-0.25 + 0.2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + 0.2x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + 0.2x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + 0.2x + x2 = 0 + 0.25
0.2x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
0.2x + x2 = 0.25

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 0.25 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 0.25 + 0.01

Combine like terms: 0.25 + 0.01 = 0.26
0.01 + 0.2x + x2 = 0.26

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 0.26

Calculate the square root of the right side: 0.509901951

Break this problem into two subproblems by setting 
(x + 0.1) equal to 0.509901951 and -0.509901951.

Subproblem 1

x + 0.1 = 0.509901951 Simplifying x + 0.1 = 0.509901951 Reorder the terms: 0.1 + x = 0.509901951 Solving 0.1 + x = 0.509901951 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 0.509901951 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 0.509901951 + -0.1 x = 0.509901951 + -0.1 Combine like terms: 0.509901951 + -0.1 = 0.409901951 x = 0.409901951 Simplifying x = 0.409901951

Subproblem 2

x + 0.1 = -0.509901951 Simplifying x + 0.1 = -0.509901951 Reorder the terms: 0.1 + x = -0.509901951 Solving 0.1 + x = -0.509901951 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -0.509901951 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -0.509901951 + -0.1 x = -0.509901951 + -0.1 Combine like terms: -0.509901951 + -0.1 = -0.609901951 x = -0.609901951 Simplifying x = -0.609901951

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.409901951, -0.609901951}

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