0=x^2+0.250x-.125

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Solution for 0=x^2+0.250x-.125 equation:


Simplifying
0 = x2 + 0.250x + -0.125

Reorder the terms:
0 = -0.125 + 0.250x + x2

Solving
0 = -0.125 + 0.250x + x2

Solving for variable 'x'.

Combine like terms: 0 + 0.125 = 0.125
0.125 + -0.250x + -1x2 = -0.125 + 0.250x + x2 + 0.125 + -0.250x + -1x2

Reorder the terms:
0.125 + -0.250x + -1x2 = -0.125 + 0.125 + 0.250x + -0.250x + x2 + -1x2

Combine like terms: -0.125 + 0.125 = 0.000
0.125 + -0.250x + -1x2 = 0.000 + 0.250x + -0.250x + x2 + -1x2
0.125 + -0.250x + -1x2 = 0.250x + -0.250x + x2 + -1x2

Combine like terms: 0.250x + -0.250x = 0.000
0.125 + -0.250x + -1x2 = 0.000 + x2 + -1x2
0.125 + -0.250x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
0.125 + -0.250x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-0.125 + 0.25x + x2 = 0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + 0.25x + 0.125 + x2 = 0 + 0.125

Reorder the terms:
-0.125 + 0.125 + 0.25x + x2 = 0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + 0.25x + x2 = 0 + 0.125
0.25x + x2 = 0 + 0.125

Combine like terms: 0 + 0.125 = 0.125
0.25x + x2 = 0.125

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 0.125 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 0.125 + 0.015625

Combine like terms: 0.125 + 0.015625 = 0.140625
0.015625 + 0.25x + x2 = 0.140625

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 0.140625

Calculate the square root of the right side: 0.375

Break this problem into two subproblems by setting 
(x + 0.125) equal to 0.375 and -0.375.

Subproblem 1

x + 0.125 = 0.375 Simplifying x + 0.125 = 0.375 Reorder the terms: 0.125 + x = 0.375 Solving 0.125 + x = 0.375 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 0.375 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 0.375 + -0.125 x = 0.375 + -0.125 Combine like terms: 0.375 + -0.125 = 0.25 x = 0.25 Simplifying x = 0.25

Subproblem 2

x + 0.125 = -0.375 Simplifying x + 0.125 = -0.375 Reorder the terms: 0.125 + x = -0.375 Solving 0.125 + x = -0.375 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -0.375 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -0.375 + -0.125 x = -0.375 + -0.125 Combine like terms: -0.375 + -0.125 = -0.5 x = -0.5 Simplifying x = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.25, -0.5}

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