6x^2=-12x-5

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Solution for 6x^2=-12x-5 equation:


Simplifying
6x2 = -12x + -5

Reorder the terms:
6x2 = -5 + -12x

Solving
6x2 = -5 + -12x

Solving for variable 'x'.

Reorder the terms:
5 + 12x + 6x2 = -5 + -12x + 5 + 12x

Reorder the terms:
5 + 12x + 6x2 = -5 + 5 + -12x + 12x

Combine like terms: -5 + 5 = 0
5 + 12x + 6x2 = 0 + -12x + 12x
5 + 12x + 6x2 = -12x + 12x

Combine like terms: -12x + 12x = 0
5 + 12x + 6x2 = 0

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

Divide each side by '6'.
0.8333333333 + 2x + x2 = 0

Move the constant term to the right:

Add '-0.8333333333' to each side of the equation.
0.8333333333 + 2x + -0.8333333333 + x2 = 0 + -0.8333333333

Reorder the terms:
0.8333333333 + -0.8333333333 + 2x + x2 = 0 + -0.8333333333

Combine like terms: 0.8333333333 + -0.8333333333 = 0.0000000000
0.0000000000 + 2x + x2 = 0 + -0.8333333333
2x + x2 = 0 + -0.8333333333

Combine like terms: 0 + -0.8333333333 = -0.8333333333
2x + x2 = -0.8333333333

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 = -0.8333333333 + 1

Reorder the terms:
1 + 2x + x2 = -0.8333333333 + 1

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

Factor a perfect square on the left side:
(x + 1)(x + 1) = 0.1666666667

Calculate the square root of the right side: 0.408248291

Break this problem into two subproblems by setting 
(x + 1) equal to 0.408248291 and -0.408248291.

Subproblem 1

x + 1 = 0.408248291 Simplifying x + 1 = 0.408248291 Reorder the terms: 1 + x = 0.408248291 Solving 1 + x = 0.408248291 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 = 0.408248291 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0.408248291 + -1 x = 0.408248291 + -1 Combine like terms: 0.408248291 + -1 = -0.591751709 x = -0.591751709 Simplifying x = -0.591751709

Subproblem 2

x + 1 = -0.408248291 Simplifying x + 1 = -0.408248291 Reorder the terms: 1 + x = -0.408248291 Solving 1 + x = -0.408248291 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 = -0.408248291 + -1 Combine like terms: 1 + -1 = 0 0 + x = -0.408248291 + -1 x = -0.408248291 + -1 Combine like terms: -0.408248291 + -1 = -1.408248291 x = -1.408248291 Simplifying x = -1.408248291

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.591751709, -1.408248291}

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