12x^2+35x+12=0

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Solution for 12x^2+35x+12=0 equation:


Simplifying
12x2 + 35x + 12 = 0

Reorder the terms:
12 + 35x + 12x2 = 0

Solving
12 + 35x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
1 + 2.916666667x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 2.916666667x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + 2.916666667x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 2.916666667x + x2 = 0 + -1
2.916666667x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
2.916666667x + x2 = -1

The x term is 2.916666667x.  Take half its coefficient (1.458333334).
Square it (2.126736113) and add it to both sides.

Add '2.126736113' to each side of the equation.
2.916666667x + 2.126736113 + x2 = -1 + 2.126736113

Reorder the terms:
2.126736113 + 2.916666667x + x2 = -1 + 2.126736113

Combine like terms: -1 + 2.126736113 = 1.126736113
2.126736113 + 2.916666667x + x2 = 1.126736113

Factor a perfect square on the left side:
(x + 1.458333334)(x + 1.458333334) = 1.126736113

Calculate the square root of the right side: 1.061478268

Break this problem into two subproblems by setting 
(x + 1.458333334) equal to 1.061478268 and -1.061478268.

Subproblem 1

x + 1.458333334 = 1.061478268 Simplifying x + 1.458333334 = 1.061478268 Reorder the terms: 1.458333334 + x = 1.061478268 Solving 1.458333334 + x = 1.061478268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.458333334' to each side of the equation. 1.458333334 + -1.458333334 + x = 1.061478268 + -1.458333334 Combine like terms: 1.458333334 + -1.458333334 = 0.000000000 0.000000000 + x = 1.061478268 + -1.458333334 x = 1.061478268 + -1.458333334 Combine like terms: 1.061478268 + -1.458333334 = -0.396855066 x = -0.396855066 Simplifying x = -0.396855066

Subproblem 2

x + 1.458333334 = -1.061478268 Simplifying x + 1.458333334 = -1.061478268 Reorder the terms: 1.458333334 + x = -1.061478268 Solving 1.458333334 + x = -1.061478268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.458333334' to each side of the equation. 1.458333334 + -1.458333334 + x = -1.061478268 + -1.458333334 Combine like terms: 1.458333334 + -1.458333334 = 0.000000000 0.000000000 + x = -1.061478268 + -1.458333334 x = -1.061478268 + -1.458333334 Combine like terms: -1.061478268 + -1.458333334 = -2.519811602 x = -2.519811602 Simplifying x = -2.519811602

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.396855066, -2.519811602}

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