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 = 0.154508497 x = 0.154508497 Simplifying x = 0.154508497

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 = -0.404508497 x = -0.404508497 Simplifying x = -0.404508497

Solution

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

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