6x^2+12x=-1

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Solution for 6x^2+12x=-1 equation:


Simplifying
6x2 + 12x = -1

Reorder the terms:
12x + 6x2 = -1

Solving
12x + 6x2 = -1

Solving for variable 'x'.

Reorder the terms:
1 + 12x + 6x2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + 12x + 6x2 = 0

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

Divide each side by '6'.
0.1666666667 + 2x + x2 = 0

Move the constant term to the right:

Add '-0.1666666667' to each side of the equation.
0.1666666667 + 2x + -0.1666666667 + x2 = 0 + -0.1666666667

Reorder the terms:
0.1666666667 + -0.1666666667 + 2x + x2 = 0 + -0.1666666667

Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000
0.0000000000 + 2x + x2 = 0 + -0.1666666667
2x + x2 = 0 + -0.1666666667

Combine like terms: 0 + -0.1666666667 = -0.1666666667
2x + x2 = -0.1666666667

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = -0.1666666667 + 1

Reorder the terms:
1 + 2x + x2 = -0.1666666667 + 1

Combine like terms: -0.1666666667 + 1 = 0.8333333333
1 + 2x + x2 = 0.8333333333

Factor a perfect square on the left side:
(x + 1)(x + 1) = 0.8333333333

Calculate the square root of the right side: 0.912870929

Break this problem into two subproblems by setting 
(x + 1) equal to 0.912870929 and -0.912870929.

Subproblem 1

x + 1 = 0.912870929 Simplifying x + 1 = 0.912870929 Reorder the terms: 1 + x = 0.912870929 Solving 1 + x = 0.912870929 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0.912870929 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0.912870929 + -1 x = 0.912870929 + -1 Combine like terms: 0.912870929 + -1 = -0.087129071 x = -0.087129071 Simplifying x = -0.087129071

Subproblem 2

x + 1 = -0.912870929 Simplifying x + 1 = -0.912870929 Reorder the terms: 1 + x = -0.912870929 Solving 1 + x = -0.912870929 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -0.912870929 + -1 Combine like terms: 1 + -1 = 0 0 + x = -0.912870929 + -1 x = -0.912870929 + -1 Combine like terms: -0.912870929 + -1 = -1.912870929 x = -1.912870929 Simplifying x = -1.912870929

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.087129071, -1.912870929}

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