0=-6x^2+2.2x+1.21

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Solution for 0=-6x^2+2.2x+1.21 equation:


Simplifying
0 = -6x2 + 2.2x + 1.21

Reorder the terms:
0 = 1.21 + 2.2x + -6x2

Solving
0 = 1.21 + 2.2x + -6x2

Solving for variable 'x'.

Combine like terms: 0 + -1.21 = -1.21
-1.21 + -2.2x + 6x2 = 1.21 + 2.2x + -6x2 + -1.21 + -2.2x + 6x2

Reorder the terms:
-1.21 + -2.2x + 6x2 = 1.21 + -1.21 + 2.2x + -2.2x + -6x2 + 6x2

Combine like terms: 1.21 + -1.21 = 0.00
-1.21 + -2.2x + 6x2 = 0.00 + 2.2x + -2.2x + -6x2 + 6x2
-1.21 + -2.2x + 6x2 = 2.2x + -2.2x + -6x2 + 6x2

Combine like terms: 2.2x + -2.2x = 0.0
-1.21 + -2.2x + 6x2 = 0.0 + -6x2 + 6x2
-1.21 + -2.2x + 6x2 = -6x2 + 6x2

Combine like terms: -6x2 + 6x2 = 0
-1.21 + -2.2x + 6x2 = 0

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

Divide each side by '6'.
-0.2016666667 + -0.3666666667x + x2 = 0

Move the constant term to the right:

Add '0.2016666667' to each side of the equation.
-0.2016666667 + -0.3666666667x + 0.2016666667 + x2 = 0 + 0.2016666667

Reorder the terms:
-0.2016666667 + 0.2016666667 + -0.3666666667x + x2 = 0 + 0.2016666667

Combine like terms: -0.2016666667 + 0.2016666667 = 0.0000000000
0.0000000000 + -0.3666666667x + x2 = 0 + 0.2016666667
-0.3666666667x + x2 = 0 + 0.2016666667

Combine like terms: 0 + 0.2016666667 = 0.2016666667
-0.3666666667x + x2 = 0.2016666667

The x term is -0.3666666667x.  Take half its coefficient (-0.1833333334).
Square it (0.03361111114) and add it to both sides.

Add '0.03361111114' to each side of the equation.
-0.3666666667x + 0.03361111114 + x2 = 0.2016666667 + 0.03361111114

Reorder the terms:
0.03361111114 + -0.3666666667x + x2 = 0.2016666667 + 0.03361111114

Combine like terms: 0.2016666667 + 0.03361111114 = 0.23527777784
0.03361111114 + -0.3666666667x + x2 = 0.23527777784

Factor a perfect square on the left side:
(x + -0.1833333334)(x + -0.1833333334) = 0.23527777784

Calculate the square root of the right side: 0.485054407

Break this problem into two subproblems by setting 
(x + -0.1833333334) equal to 0.485054407 and -0.485054407.

Subproblem 1

x + -0.1833333334 = 0.485054407 Simplifying x + -0.1833333334 = 0.485054407 Reorder the terms: -0.1833333334 + x = 0.485054407 Solving -0.1833333334 + x = 0.485054407 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1833333334' to each side of the equation. -0.1833333334 + 0.1833333334 + x = 0.485054407 + 0.1833333334 Combine like terms: -0.1833333334 + 0.1833333334 = 0.0000000000 0.0000000000 + x = 0.485054407 + 0.1833333334 x = 0.485054407 + 0.1833333334 Combine like terms: 0.485054407 + 0.1833333334 = 0.6683877404 x = 0.6683877404 Simplifying x = 0.6683877404

Subproblem 2

x + -0.1833333334 = -0.485054407 Simplifying x + -0.1833333334 = -0.485054407 Reorder the terms: -0.1833333334 + x = -0.485054407 Solving -0.1833333334 + x = -0.485054407 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1833333334' to each side of the equation. -0.1833333334 + 0.1833333334 + x = -0.485054407 + 0.1833333334 Combine like terms: -0.1833333334 + 0.1833333334 = 0.0000000000 0.0000000000 + x = -0.485054407 + 0.1833333334 x = -0.485054407 + 0.1833333334 Combine like terms: -0.485054407 + 0.1833333334 = -0.3017210736 x = -0.3017210736 Simplifying x = -0.3017210736

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6683877404, -0.3017210736}

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