9x^2+12x+3=1

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Solution for 9x^2+12x+3=1 equation:


Simplifying
9x2 + 12x + 3 = 1

Reorder the terms:
3 + 12x + 9x2 = 1

Solving
3 + 12x + 9x2 = 1

Solving for variable 'x'.

Reorder the terms:
3 + -1 + 12x + 9x2 = 1 + -1

Combine like terms: 3 + -1 = 2
2 + 12x + 9x2 = 1 + -1

Combine like terms: 1 + -1 = 0
2 + 12x + 9x2 = 0

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

Divide each side by '9'.
0.2222222222 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '-0.2222222222' to each side of the equation.
0.2222222222 + 1.333333333x + -0.2222222222 + x2 = 0 + -0.2222222222

Reorder the terms:
0.2222222222 + -0.2222222222 + 1.333333333x + x2 = 0 + -0.2222222222

Combine like terms: 0.2222222222 + -0.2222222222 = 0.0000000000
0.0000000000 + 1.333333333x + x2 = 0 + -0.2222222222
1.333333333x + x2 = 0 + -0.2222222222

Combine like terms: 0 + -0.2222222222 = -0.2222222222
1.333333333x + x2 = -0.2222222222

The x term is 1.333333333x.  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.
1.333333333x + 0.4444444442 + x2 = -0.2222222222 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = -0.2222222222 + 0.4444444442

Combine like terms: -0.2222222222 + 0.4444444442 = 0.222222222
0.4444444442 + 1.333333333x + x2 = 0.222222222

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

Calculate the square root of the right side: 0.471404521

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

Subproblem 1

x + 0.6666666665 = 0.471404521 Simplifying x + 0.6666666665 = 0.471404521 Reorder the terms: 0.6666666665 + x = 0.471404521 Solving 0.6666666665 + x = 0.471404521 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = 0.471404521 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 0.471404521 + -0.6666666665 x = 0.471404521 + -0.6666666665 Combine like terms: 0.471404521 + -0.6666666665 = -0.1952621455 x = -0.1952621455 Simplifying x = -0.1952621455

Subproblem 2

x + 0.6666666665 = -0.471404521 Simplifying x + 0.6666666665 = -0.471404521 Reorder the terms: 0.6666666665 + x = -0.471404521 Solving 0.6666666665 + x = -0.471404521 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = -0.471404521 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -0.471404521 + -0.6666666665 x = -0.471404521 + -0.6666666665 Combine like terms: -0.471404521 + -0.6666666665 = -1.1380711875 x = -1.1380711875 Simplifying x = -1.1380711875

Solution

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

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