x^2+.5x-.394=0

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Solution for x^2+.5x-.394=0 equation:


Simplifying
x2 + 0.5x + -0.394 = 0

Reorder the terms:
-0.394 + 0.5x + x2 = 0

Solving
-0.394 + 0.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.394' to each side of the equation.
-0.394 + 0.5x + 0.394 + x2 = 0 + 0.394

Reorder the terms:
-0.394 + 0.394 + 0.5x + x2 = 0 + 0.394

Combine like terms: -0.394 + 0.394 = 0.000
0.000 + 0.5x + x2 = 0 + 0.394
0.5x + x2 = 0 + 0.394

Combine like terms: 0 + 0.394 = 0.394
0.5x + x2 = 0.394

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 = 0.394 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 0.394 + 0.0625

Combine like terms: 0.394 + 0.0625 = 0.4565
0.0625 + 0.5x + x2 = 0.4565

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 0.4565

Calculate the square root of the right side: 0.675647837

Break this problem into two subproblems by setting 
(x + 0.25) equal to 0.675647837 and -0.675647837.

Subproblem 1

x + 0.25 = 0.675647837 Simplifying x + 0.25 = 0.675647837 Reorder the terms: 0.25 + x = 0.675647837 Solving 0.25 + x = 0.675647837 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 = 0.675647837 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 0.675647837 + -0.25 x = 0.675647837 + -0.25 Combine like terms: 0.675647837 + -0.25 = 0.425647837 x = 0.425647837 Simplifying x = 0.425647837

Subproblem 2

x + 0.25 = -0.675647837 Simplifying x + 0.25 = -0.675647837 Reorder the terms: 0.25 + x = -0.675647837 Solving 0.25 + x = -0.675647837 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 = -0.675647837 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -0.675647837 + -0.25 x = -0.675647837 + -0.25 Combine like terms: -0.675647837 + -0.25 = -0.925647837 x = -0.925647837 Simplifying x = -0.925647837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.425647837, -0.925647837}

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