3x^2+12x+1=0

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Solution for 3x^2+12x+1=0 equation:


Simplifying
3x2 + 12x + 1 = 0

Reorder the terms:
1 + 12x + 3x2 = 0

Solving
1 + 12x + 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'.
0.3333333333 + 4x + x2 = 0

Move the constant term to the right:

Add '-0.3333333333' to each side of the equation.
0.3333333333 + 4x + -0.3333333333 + x2 = 0 + -0.3333333333

Reorder the terms:
0.3333333333 + -0.3333333333 + 4x + x2 = 0 + -0.3333333333

Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000
0.0000000000 + 4x + x2 = 0 + -0.3333333333
4x + x2 = 0 + -0.3333333333

Combine like terms: 0 + -0.3333333333 = -0.3333333333
4x + x2 = -0.3333333333

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -0.3333333333 + 4

Reorder the terms:
4 + 4x + x2 = -0.3333333333 + 4

Combine like terms: -0.3333333333 + 4 = 3.6666666667
4 + 4x + x2 = 3.6666666667

Factor a perfect square on the left side:
(x + 2)(x + 2) = 3.6666666667

Calculate the square root of the right side: 1.914854216

Break this problem into two subproblems by setting 
(x + 2) equal to 1.914854216 and -1.914854216.

Subproblem 1

x + 2 = 1.914854216 Simplifying x + 2 = 1.914854216 Reorder the terms: 2 + x = 1.914854216 Solving 2 + x = 1.914854216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 1.914854216 + -2 Combine like terms: 2 + -2 = 0 0 + x = 1.914854216 + -2 x = 1.914854216 + -2 Combine like terms: 1.914854216 + -2 = -0.085145784 x = -0.085145784 Simplifying x = -0.085145784

Subproblem 2

x + 2 = -1.914854216 Simplifying x + 2 = -1.914854216 Reorder the terms: 2 + x = -1.914854216 Solving 2 + x = -1.914854216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -1.914854216 + -2 Combine like terms: 2 + -2 = 0 0 + x = -1.914854216 + -2 x = -1.914854216 + -2 Combine like terms: -1.914854216 + -2 = -3.914854216 x = -3.914854216 Simplifying x = -3.914854216

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.085145784, -3.914854216}

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