0.11x^2-3x+9=0

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Solution for 0.11x^2-3x+9=0 equation:


Simplifying
0.11x2 + -3x + 9 = 0

Reorder the terms:
9 + -3x + 0.11x2 = 0

Solving
9 + -3x + 0.11x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.11'.
81.81818182 + -27.27272727x + x2 = 0

Move the constant term to the right:

Add '-81.81818182' to each side of the equation.
81.81818182 + -27.27272727x + -81.81818182 + x2 = 0 + -81.81818182

Reorder the terms:
81.81818182 + -81.81818182 + -27.27272727x + x2 = 0 + -81.81818182

Combine like terms: 81.81818182 + -81.81818182 = 0.00000000
0.00000000 + -27.27272727x + x2 = 0 + -81.81818182
-27.27272727x + x2 = 0 + -81.81818182

Combine like terms: 0 + -81.81818182 = -81.81818182
-27.27272727x + x2 = -81.81818182

The x term is -27.27272727x.  Take half its coefficient (-13.63636364).
Square it (185.9504133) and add it to both sides.

Add '185.9504133' to each side of the equation.
-27.27272727x + 185.9504133 + x2 = -81.81818182 + 185.9504133

Reorder the terms:
185.9504133 + -27.27272727x + x2 = -81.81818182 + 185.9504133

Combine like terms: -81.81818182 + 185.9504133 = 104.13223148
185.9504133 + -27.27272727x + x2 = 104.13223148

Factor a perfect square on the left side:
(x + -13.63636364)(x + -13.63636364) = 104.13223148

Calculate the square root of the right side: 10.204520149

Break this problem into two subproblems by setting 
(x + -13.63636364) equal to 10.204520149 and -10.204520149.

Subproblem 1

x + -13.63636364 = 10.204520149 Simplifying x + -13.63636364 = 10.204520149 Reorder the terms: -13.63636364 + x = 10.204520149 Solving -13.63636364 + x = 10.204520149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13.63636364' to each side of the equation. -13.63636364 + 13.63636364 + x = 10.204520149 + 13.63636364 Combine like terms: -13.63636364 + 13.63636364 = 0.00000000 0.00000000 + x = 10.204520149 + 13.63636364 x = 10.204520149 + 13.63636364 Combine like terms: 10.204520149 + 13.63636364 = 23.840883789 x = 23.840883789 Simplifying x = 23.840883789

Subproblem 2

x + -13.63636364 = -10.204520149 Simplifying x + -13.63636364 = -10.204520149 Reorder the terms: -13.63636364 + x = -10.204520149 Solving -13.63636364 + x = -10.204520149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13.63636364' to each side of the equation. -13.63636364 + 13.63636364 + x = -10.204520149 + 13.63636364 Combine like terms: -13.63636364 + 13.63636364 = 0.00000000 0.00000000 + x = -10.204520149 + 13.63636364 x = -10.204520149 + 13.63636364 Combine like terms: -10.204520149 + 13.63636364 = 3.431843491 x = 3.431843491 Simplifying x = 3.431843491

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.840883789, 3.431843491}

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