3x^2-1.1x-3=0

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Solution for 3x^2-1.1x-3=0 equation:


Simplifying
3x2 + -1.1x + -3 = 0

Reorder the terms:
-3 + -1.1x + 3x2 = 0

Solving
-3 + -1.1x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-1 + -0.3666666667x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.3666666667x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.3666666667x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.3666666667x + x2 = 0 + 1
-0.3666666667x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.3666666667x + x2 = 1

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 = 1 + 0.03361111114

Reorder the terms:
0.03361111114 + -0.3666666667x + x2 = 1 + 0.03361111114

Combine like terms: 1 + 0.03361111114 = 1.03361111114
0.03361111114 + -0.3666666667x + x2 = 1.03361111114

Factor a perfect square on the left side:
(x + -0.1833333334)(x + -0.1833333334) = 1.03361111114

Calculate the square root of the right side: 1.016666667

Break this problem into two subproblems by setting 
(x + -0.1833333334) equal to 1.016666667 and -1.016666667.

Subproblem 1

x + -0.1833333334 = 1.016666667 Simplifying x + -0.1833333334 = 1.016666667 Reorder the terms: -0.1833333334 + x = 1.016666667 Solving -0.1833333334 + x = 1.016666667 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 = 1.016666667 + 0.1833333334 Combine like terms: -0.1833333334 + 0.1833333334 = 0.0000000000 0.0000000000 + x = 1.016666667 + 0.1833333334 x = 1.016666667 + 0.1833333334 Combine like terms: 1.016666667 + 0.1833333334 = 1.2000000004 x = 1.2000000004 Simplifying x = 1.2000000004

Subproblem 2

x + -0.1833333334 = -1.016666667 Simplifying x + -0.1833333334 = -1.016666667 Reorder the terms: -0.1833333334 + x = -1.016666667 Solving -0.1833333334 + x = -1.016666667 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 = -1.016666667 + 0.1833333334 Combine like terms: -0.1833333334 + 0.1833333334 = 0.0000000000 0.0000000000 + x = -1.016666667 + 0.1833333334 x = -1.016666667 + 0.1833333334 Combine like terms: -1.016666667 + 0.1833333334 = -0.8333333336 x = -0.8333333336 Simplifying x = -0.8333333336

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2000000004, -0.8333333336}

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