9d^2+12d+2=0

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Solution for 9d^2+12d+2=0 equation: 


Simplifying
9d2 + 12d + 2 = 0

Reorder the terms:
2 + 12d + 9d2 = 0

Solving
2 + 12d + 9d2 = 0

Solving for variable 'd'.

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

Divide each side by '9'.
0.2222222222 + 1.333333333d + d2 = 0

Move the constant term to the right:

Add '-0.2222222222' to each side of the equation.
0.2222222222 + 1.333333333d + -0.2222222222 + d2 = 0 + -0.2222222222

Reorder the terms:
0.2222222222 + -0.2222222222 + 1.333333333d + d2 = 0 + -0.2222222222

Combine like terms: 0.2222222222 + -0.2222222222 = 0.0000000000
0.0000000000 + 1.333333333d + d2 = 0 + -0.2222222222
1.333333333d + d2 = 0 + -0.2222222222

Combine like terms: 0 + -0.2222222222 = -0.2222222222
1.333333333d + d2 = -0.2222222222

The d term is 1.333333333d.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333d + 0.4444444442 + d2 = -0.2222222222 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333d + d2 = -0.2222222222 + 0.4444444442

Combine like terms: -0.2222222222 + 0.4444444442 = 0.222222222
0.4444444442 + 1.333333333d + d2 = 0.222222222

Factor a perfect square on the left side:
(d + 0.6666666665)(d + 0.6666666665) = 0.222222222

Calculate the square root of the right side: 0.471404521

Break this problem into two subproblems by setting 
(d + 0.6666666665) equal to 0.471404521 and -0.471404521.


Subproblem 1
d + 0.6666666665 = 0.471404521

Simplifying
d + 0.6666666665 = 0.471404521

Reorder the terms:
0.6666666665 + d = 0.471404521

Solving
0.6666666665 + d = 0.471404521

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '-0.6666666665' to each side of the equation.
0.6666666665 + -0.6666666665 + d = 0.471404521 + -0.6666666665

Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000
0.0000000000 + d = 0.471404521 + -0.6666666665
d = 0.471404521 + -0.6666666665

Combine like terms: 0.471404521 + -0.6666666665 = -0.1952621455
d = -0.1952621455

Simplifying
d = -0.1952621455


Subproblem 2
d + 0.6666666665 = -0.471404521

Simplifying
d + 0.6666666665 = -0.471404521

Reorder the terms:
0.6666666665 + d = -0.471404521

Solving
0.6666666665 + d = -0.471404521

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '-0.6666666665' to each side of the equation.
0.6666666665 + -0.6666666665 + d = -0.471404521 + -0.6666666665

Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000
0.0000000000 + d = -0.471404521 + -0.6666666665
d = -0.471404521 + -0.6666666665

Combine like terms: -0.471404521 + -0.6666666665 = -1.1380711875
d = -1.1380711875

Simplifying
d = -1.1380711875


Solution
The solution to the problem is based on the solutions
from the subproblems.
d = {-0.1952621455, -1.1380711875}

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