9x^2+6x+1=12

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Solution for 9x^2+6x+1=12 equation:


Simplifying
9x2 + 6x + 1 = 12

Reorder the terms:
1 + 6x + 9x2 = 12

Solving
1 + 6x + 9x2 = 12

Solving for variable 'x'.

Reorder the terms:
1 + -12 + 6x + 9x2 = 12 + -12

Combine like terms: 1 + -12 = -11
-11 + 6x + 9x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-11 + 6x + 9x2 = 0

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

Divide each side by '9'.
-1.222222222 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '1.222222222' to each side of the equation.
-1.222222222 + 0.6666666667x + 1.222222222 + x2 = 0 + 1.222222222

Reorder the terms:
-1.222222222 + 1.222222222 + 0.6666666667x + x2 = 0 + 1.222222222

Combine like terms: -1.222222222 + 1.222222222 = 0.000000000
0.000000000 + 0.6666666667x + x2 = 0 + 1.222222222
0.6666666667x + x2 = 0 + 1.222222222

Combine like terms: 0 + 1.222222222 = 1.222222222
0.6666666667x + x2 = 1.222222222

The x term is 0.6666666667x.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667x + 0.1111111112 + x2 = 1.222222222 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 1.222222222 + 0.1111111112

Combine like terms: 1.222222222 + 0.1111111112 = 1.3333333332
0.1111111112 + 0.6666666667x + x2 = 1.3333333332

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 1.3333333332

Calculate the square root of the right side: 1.154700538

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 1.154700538 and -1.154700538.

Subproblem 1

x + 0.3333333334 = 1.154700538 Simplifying x + 0.3333333334 = 1.154700538 Reorder the terms: 0.3333333334 + x = 1.154700538 Solving 0.3333333334 + x = 1.154700538 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 1.154700538 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 1.154700538 + -0.3333333334 x = 1.154700538 + -0.3333333334 Combine like terms: 1.154700538 + -0.3333333334 = 0.8213672046 x = 0.8213672046 Simplifying x = 0.8213672046

Subproblem 2

x + 0.3333333334 = -1.154700538 Simplifying x + 0.3333333334 = -1.154700538 Reorder the terms: 0.3333333334 + x = -1.154700538 Solving 0.3333333334 + x = -1.154700538 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -1.154700538 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -1.154700538 + -0.3333333334 x = -1.154700538 + -0.3333333334 Combine like terms: -1.154700538 + -0.3333333334 = -1.4880338714 x = -1.4880338714 Simplifying x = -1.4880338714

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8213672046, -1.4880338714}

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