3x^2+66x=-2

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Solution for 3x^2+66x=-2 equation:


Simplifying
3x2 + 66x = -2

Reorder the terms:
66x + 3x2 = -2

Solving
66x + 3x2 = -2

Solving for variable 'x'.

Reorder the terms:
2 + 66x + 3x2 = -2 + 2

Combine like terms: -2 + 2 = 0
2 + 66x + 3x2 = 0

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

Divide each side by '3'.
0.6666666667 + 22x + x2 = 0

Move the constant term to the right:

Add '-0.6666666667' to each side of the equation.
0.6666666667 + 22x + -0.6666666667 + x2 = 0 + -0.6666666667

Reorder the terms:
0.6666666667 + -0.6666666667 + 22x + x2 = 0 + -0.6666666667

Combine like terms: 0.6666666667 + -0.6666666667 = 0.0000000000
0.0000000000 + 22x + x2 = 0 + -0.6666666667
22x + x2 = 0 + -0.6666666667

Combine like terms: 0 + -0.6666666667 = -0.6666666667
22x + x2 = -0.6666666667

The x term is 22x.  Take half its coefficient (11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
22x + 121 + x2 = -0.6666666667 + 121

Reorder the terms:
121 + 22x + x2 = -0.6666666667 + 121

Combine like terms: -0.6666666667 + 121 = 120.3333333333
121 + 22x + x2 = 120.3333333333

Factor a perfect square on the left side:
(x + 11)(x + 11) = 120.3333333333

Calculate the square root of the right side: 10.969655115

Break this problem into two subproblems by setting 
(x + 11) equal to 10.969655115 and -10.969655115.

Subproblem 1

x + 11 = 10.969655115 Simplifying x + 11 = 10.969655115 Reorder the terms: 11 + x = 10.969655115 Solving 11 + x = 10.969655115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = 10.969655115 + -11 Combine like terms: 11 + -11 = 0 0 + x = 10.969655115 + -11 x = 10.969655115 + -11 Combine like terms: 10.969655115 + -11 = -0.030344885 x = -0.030344885 Simplifying x = -0.030344885

Subproblem 2

x + 11 = -10.969655115 Simplifying x + 11 = -10.969655115 Reorder the terms: 11 + x = -10.969655115 Solving 11 + x = -10.969655115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = -10.969655115 + -11 Combine like terms: 11 + -11 = 0 0 + x = -10.969655115 + -11 x = -10.969655115 + -11 Combine like terms: -10.969655115 + -11 = -21.969655115 x = -21.969655115 Simplifying x = -21.969655115

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.030344885, -21.969655115}

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