(2X^2)-4X-1=0

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Solution for (2X^2)-4X-1=0 equation:


Simplifying
(2X2) + -4X + -1 = 0

Reorder the terms:
-1 + -4X + (2X2) = 0

Solving
-1 + -4X + (2X2) = 0

Solving for variable 'X'.

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

Divide each side by '2'.
-0.5 + -2X + X2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -2X + 0.5 + X2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -2X + X2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -2X + X2 = 0 + 0.5
-2X + X2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-2X + X2 = 0.5

The X term is -2X.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2X + 1 + X2 = 0.5 + 1

Reorder the terms:
1 + -2X + X2 = 0.5 + 1

Combine like terms: 0.5 + 1 = 1.5
1 + -2X + X2 = 1.5

Factor a perfect square on the left side:
((X) + -1)((X) + -1) = 1.5

Calculate the square root of the right side: 1.224744871

Break this problem into two subproblems by setting 
((X) + -1) equal to 1.224744871 and -1.224744871.

Subproblem 1

(X) + -1 = 1.224744871 Simplifying (X) + -1 = 1.224744871 X + -1 = 1.224744871 Reorder the terms: -1 + X = 1.224744871 Solving -1 + X = 1.224744871 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + X = 1.224744871 + 1 Combine like terms: -1 + 1 = 0 0 + X = 1.224744871 + 1 X = 1.224744871 + 1 Combine like terms: 1.224744871 + 1 = 2.224744871 X = 2.224744871 Simplifying X = 2.224744871

Subproblem 2

(X) + -1 = -1.224744871 Simplifying (X) + -1 = -1.224744871 X + -1 = -1.224744871 Reorder the terms: -1 + X = -1.224744871 Solving -1 + X = -1.224744871 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + X = -1.224744871 + 1 Combine like terms: -1 + 1 = 0 0 + X = -1.224744871 + 1 X = -1.224744871 + 1 Combine like terms: -1.224744871 + 1 = -0.224744871 X = -0.224744871 Simplifying X = -0.224744871

Solution

The solution to the problem is based on the solutions from the subproblems. X = {2.224744871, -0.224744871}

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