16x^2-4x-1=0

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Solution for 16x^2-4x-1=0 equation: 


Simplifying
16x2 + -4x + -1 = 0

Reorder the terms:
-1 + -4x + 16x2 = 0

Solving
-1 + -4x + 16x2 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
-0.0625 + -0.25x + x2 = 0

Move the constant term to the right:

Add '0.0625' to each side of the equation.
-0.0625 + -0.25x + 0.0625 + x2 = 0 + 0.0625

Reorder the terms:
-0.0625 + 0.0625 + -0.25x + x2 = 0 + 0.0625

Combine like terms: -0.0625 + 0.0625 = 0.0000
0.0000 + -0.25x + x2 = 0 + 0.0625
-0.25x + x2 = 0 + 0.0625

Combine like terms: 0 + 0.0625 = 0.0625
-0.25x + x2 = 0.0625

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 = 0.0625 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = 0.0625 + 0.015625

Combine like terms: 0.0625 + 0.015625 = 0.078125
0.015625 + -0.25x + x2 = 0.078125

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 0.078125

Calculate the square root of the right side: 0.279508497

Break this problem into two subproblems by setting 
(x + -0.125) equal to 0.279508497 and -0.279508497.


Subproblem 1
x + -0.125 = 0.279508497

Simplifying
x + -0.125 = 0.279508497

Reorder the terms:
-0.125 + x = 0.279508497

Solving
-0.125 + x = 0.279508497

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 = 0.279508497 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + x = 0.279508497 + 0.125
x = 0.279508497 + 0.125

Combine like terms: 0.279508497 + 0.125 = 0.404508497
x = 0.404508497

Simplifying
x = 0.404508497


Subproblem 2
x + -0.125 = -0.279508497

Simplifying
x + -0.125 = -0.279508497

Reorder the terms:
-0.125 + x = -0.279508497

Solving
-0.125 + x = -0.279508497

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 = -0.279508497 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + x = -0.279508497 + 0.125
x = -0.279508497 + 0.125

Combine like terms: -0.279508497 + 0.125 = -0.154508497
x = -0.154508497

Simplifying
x = -0.154508497


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.404508497, -0.154508497}

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