0=3x^2-12x-1

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


Simplifying
0 = 3x2 + -12x + -1

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

Solving
0 = -1 + -12x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 1 = 1
1 + 12x + -3x2 = -1 + -12x + 3x2 + 1 + 12x + -3x2

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

Combine like terms: -1 + 1 = 0
1 + 12x + -3x2 = 0 + -12x + 12x + 3x2 + -3x2
1 + 12x + -3x2 = -12x + 12x + 3x2 + -3x2

Combine like terms: -12x + 12x = 0
1 + 12x + -3x2 = 0 + 3x2 + -3x2
1 + 12x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
1 + 12x + -3x2 = 0

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 = 4.3333333333
4 + -4x + x2 = 4.3333333333

Factor a perfect square on the left side:
(x + -2)(x + -2) = 4.3333333333

Calculate the square root of the right side: 2.081665999

Break this problem into two subproblems by setting 
(x + -2) equal to 2.081665999 and -2.081665999.

Subproblem 1

x + -2 = 2.081665999 Simplifying x + -2 = 2.081665999 Reorder the terms: -2 + x = 2.081665999 Solving -2 + x = 2.081665999 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 = 2.081665999 + 2 Combine like terms: -2 + 2 = 0 0 + x = 2.081665999 + 2 x = 2.081665999 + 2 Combine like terms: 2.081665999 + 2 = 4.081665999 x = 4.081665999 Simplifying x = 4.081665999

Subproblem 2

x + -2 = -2.081665999 Simplifying x + -2 = -2.081665999 Reorder the terms: -2 + x = -2.081665999 Solving -2 + x = -2.081665999 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 = -2.081665999 + 2 Combine like terms: -2 + 2 = 0 0 + x = -2.081665999 + 2 x = -2.081665999 + 2 Combine like terms: -2.081665999 + 2 = -0.081665999 x = -0.081665999 Simplifying x = -0.081665999

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.081665999, -0.081665999}

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