2x^2+12x=-1

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


Simplifying
2x2 + 12x = -1

Reorder the terms:
12x + 2x2 = -1

Solving
12x + 2x2 = -1

Solving for variable 'x'.

Reorder the terms:
1 + 12x + 2x2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + 12x + 2x2 = 0

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

Divide each side by '2'.
0.5 + 6x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 6x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 6x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 6x + x2 = 0 + -0.5
6x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
6x + x2 = -0.5

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = -0.5 + 9

Reorder the terms:
9 + 6x + x2 = -0.5 + 9

Combine like terms: -0.5 + 9 = 8.5
9 + 6x + x2 = 8.5

Factor a perfect square on the left side:
(x + 3)(x + 3) = 8.5

Calculate the square root of the right side: 2.915475947

Break this problem into two subproblems by setting 
(x + 3) equal to 2.915475947 and -2.915475947.

Subproblem 1

x + 3 = 2.915475947 Simplifying x + 3 = 2.915475947 Reorder the terms: 3 + x = 2.915475947 Solving 3 + x = 2.915475947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 2.915475947 + -3 Combine like terms: 3 + -3 = 0 0 + x = 2.915475947 + -3 x = 2.915475947 + -3 Combine like terms: 2.915475947 + -3 = -0.084524053 x = -0.084524053 Simplifying x = -0.084524053

Subproblem 2

x + 3 = -2.915475947 Simplifying x + 3 = -2.915475947 Reorder the terms: 3 + x = -2.915475947 Solving 3 + x = -2.915475947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -2.915475947 + -3 Combine like terms: 3 + -3 = 0 0 + x = -2.915475947 + -3 x = -2.915475947 + -3 Combine like terms: -2.915475947 + -3 = -5.915475947 x = -5.915475947 Simplifying x = -5.915475947

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.084524053, -5.915475947}

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