3b^2+13b+6=

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Solution for 3b^2+13b+6= equation:


Simplifying
3b2 + 13b + 6 = 0

Reorder the terms:
6 + 13b + 3b2 = 0

Solving
6 + 13b + 3b2 = 0

Solving for variable 'b'.

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

Divide each side by '3'.
2 + 4.333333333b + b2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 4.333333333b + -2 + b2 = 0 + -2

Reorder the terms:
2 + -2 + 4.333333333b + b2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 4.333333333b + b2 = 0 + -2
4.333333333b + b2 = 0 + -2

Combine like terms: 0 + -2 = -2
4.333333333b + b2 = -2

The b term is 4.333333333b.  Take half its coefficient (2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
4.333333333b + 4.694444446 + b2 = -2 + 4.694444446

Reorder the terms:
4.694444446 + 4.333333333b + b2 = -2 + 4.694444446

Combine like terms: -2 + 4.694444446 = 2.694444446
4.694444446 + 4.333333333b + b2 = 2.694444446

Factor a perfect square on the left side:
(b + 2.166666667)(b + 2.166666667) = 2.694444446

Calculate the square root of the right side: 1.641476301

Break this problem into two subproblems by setting 
(b + 2.166666667) equal to 1.641476301 and -1.641476301.

Subproblem 1

b + 2.166666667 = 1.641476301 Simplifying b + 2.166666667 = 1.641476301 Reorder the terms: 2.166666667 + b = 1.641476301 Solving 2.166666667 + b = 1.641476301 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + b = 1.641476301 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + b = 1.641476301 + -2.166666667 b = 1.641476301 + -2.166666667 Combine like terms: 1.641476301 + -2.166666667 = -0.525190366 b = -0.525190366 Simplifying b = -0.525190366

Subproblem 2

b + 2.166666667 = -1.641476301 Simplifying b + 2.166666667 = -1.641476301 Reorder the terms: 2.166666667 + b = -1.641476301 Solving 2.166666667 + b = -1.641476301 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + b = -1.641476301 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + b = -1.641476301 + -2.166666667 b = -1.641476301 + -2.166666667 Combine like terms: -1.641476301 + -2.166666667 = -3.808142968 b = -3.808142968 Simplifying b = -3.808142968

Solution

The solution to the problem is based on the solutions from the subproblems. b = {-0.525190366, -3.808142968}

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