4*x^2-2*x-2.6=0

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Solution for 4*x^2-2*x-2.6=0 equation:


Simplifying
4x2 + -2x + -2.6 = 0

Reorder the terms:
-2.6 + -2x + 4x2 = 0

Solving
-2.6 + -2x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-0.65 + -0.5x + x2 = 0

Move the constant term to the right:

Add '0.65' to each side of the equation.
-0.65 + -0.5x + 0.65 + x2 = 0 + 0.65

Reorder the terms:
-0.65 + 0.65 + -0.5x + x2 = 0 + 0.65

Combine like terms: -0.65 + 0.65 = 0.00
0.00 + -0.5x + x2 = 0 + 0.65
-0.5x + x2 = 0 + 0.65

Combine like terms: 0 + 0.65 = 0.65
-0.5x + x2 = 0.65

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 0.65 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 0.65 + 0.0625

Combine like terms: 0.65 + 0.0625 = 0.7125
0.0625 + -0.5x + x2 = 0.7125

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 0.7125

Calculate the square root of the right side: 0.844097151

Break this problem into two subproblems by setting 
(x + -0.25) equal to 0.844097151 and -0.844097151.

Subproblem 1

x + -0.25 = 0.844097151 Simplifying x + -0.25 = 0.844097151 Reorder the terms: -0.25 + x = 0.844097151 Solving -0.25 + x = 0.844097151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 0.844097151 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 0.844097151 + 0.25 x = 0.844097151 + 0.25 Combine like terms: 0.844097151 + 0.25 = 1.094097151 x = 1.094097151 Simplifying x = 1.094097151

Subproblem 2

x + -0.25 = -0.844097151 Simplifying x + -0.25 = -0.844097151 Reorder the terms: -0.25 + x = -0.844097151 Solving -0.25 + x = -0.844097151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -0.844097151 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -0.844097151 + 0.25 x = -0.844097151 + 0.25 Combine like terms: -0.844097151 + 0.25 = -0.594097151 x = -0.594097151 Simplifying x = -0.594097151

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.094097151, -0.594097151}

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