6x^2+66x+11=0

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Solution for 6x^2+66x+11=0 equation:


Simplifying
6x2 + 66x + 11 = 0

Reorder the terms:
11 + 66x + 6x2 = 0

Solving
11 + 66x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
1.833333333 + 11x + x2 = 0

Move the constant term to the right:

Add '-1.833333333' to each side of the equation.
1.833333333 + 11x + -1.833333333 + x2 = 0 + -1.833333333

Reorder the terms:
1.833333333 + -1.833333333 + 11x + x2 = 0 + -1.833333333

Combine like terms: 1.833333333 + -1.833333333 = 0.000000000
0.000000000 + 11x + x2 = 0 + -1.833333333
11x + x2 = 0 + -1.833333333

Combine like terms: 0 + -1.833333333 = -1.833333333
11x + x2 = -1.833333333

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = -1.833333333 + 30.25

Reorder the terms:
30.25 + 11x + x2 = -1.833333333 + 30.25

Combine like terms: -1.833333333 + 30.25 = 28.416666667
30.25 + 11x + x2 = 28.416666667

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 28.416666667

Calculate the square root of the right side: 5.330728531

Break this problem into two subproblems by setting 
(x + 5.5) equal to 5.330728531 and -5.330728531.

Subproblem 1

x + 5.5 = 5.330728531 Simplifying x + 5.5 = 5.330728531 Reorder the terms: 5.5 + x = 5.330728531 Solving 5.5 + x = 5.330728531 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 5.330728531 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 5.330728531 + -5.5 x = 5.330728531 + -5.5 Combine like terms: 5.330728531 + -5.5 = -0.169271469 x = -0.169271469 Simplifying x = -0.169271469

Subproblem 2

x + 5.5 = -5.330728531 Simplifying x + 5.5 = -5.330728531 Reorder the terms: 5.5 + x = -5.330728531 Solving 5.5 + x = -5.330728531 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -5.330728531 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -5.330728531 + -5.5 x = -5.330728531 + -5.5 Combine like terms: -5.330728531 + -5.5 = -10.830728531 x = -10.830728531 Simplifying x = -10.830728531

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.169271469, -10.830728531}

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