x^2+0.25*x-16=0

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Solution for x^2+0.25*x-16=0 equation:


Simplifying
x2 + 0.25x + -16 = 0

Reorder the terms:
-16 + 0.25x + x2 = 0

Solving
-16 + 0.25x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 0.25x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 0.25x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 0.25x + x2 = 0 + 16
0.25x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
0.25x + x2 = 16

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 = 16 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 16 + 0.015625

Combine like terms: 16 + 0.015625 = 16.015625
0.015625 + 0.25x + x2 = 16.015625

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 16.015625

Calculate the square root of the right side: 4.001952648

Break this problem into two subproblems by setting 
(x + 0.125) equal to 4.001952648 and -4.001952648.

Subproblem 1

x + 0.125 = 4.001952648 Simplifying x + 0.125 = 4.001952648 Reorder the terms: 0.125 + x = 4.001952648 Solving 0.125 + x = 4.001952648 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 = 4.001952648 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 4.001952648 + -0.125 x = 4.001952648 + -0.125 Combine like terms: 4.001952648 + -0.125 = 3.876952648 x = 3.876952648 Simplifying x = 3.876952648

Subproblem 2

x + 0.125 = -4.001952648 Simplifying x + 0.125 = -4.001952648 Reorder the terms: 0.125 + x = -4.001952648 Solving 0.125 + x = -4.001952648 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 = -4.001952648 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -4.001952648 + -0.125 x = -4.001952648 + -0.125 Combine like terms: -4.001952648 + -0.125 = -4.126952648 x = -4.126952648 Simplifying x = -4.126952648

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.876952648, -4.126952648}

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