2b+3b(3b+1)=17

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Solution for 2b+3b(3b+1)=17 equation:


Simplifying
2b + 3b(3b + 1) = 17

Reorder the terms:
2b + 3b(1 + 3b) = 17
2b + (1 * 3b + 3b * 3b) = 17
2b + (3b + 9b2) = 17

Combine like terms: 2b + 3b = 5b
5b + 9b2 = 17

Solving
5b + 9b2 = 17

Solving for variable 'b'.

Reorder the terms:
-17 + 5b + 9b2 = 17 + -17

Combine like terms: 17 + -17 = 0
-17 + 5b + 9b2 = 0

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

Divide each side by '9'.
-1.888888889 + 0.5555555556b + b2 = 0

Move the constant term to the right:

Add '1.888888889' to each side of the equation.
-1.888888889 + 0.5555555556b + 1.888888889 + b2 = 0 + 1.888888889

Reorder the terms:
-1.888888889 + 1.888888889 + 0.5555555556b + b2 = 0 + 1.888888889

Combine like terms: -1.888888889 + 1.888888889 = 0.000000000
0.000000000 + 0.5555555556b + b2 = 0 + 1.888888889
0.5555555556b + b2 = 0 + 1.888888889

Combine like terms: 0 + 1.888888889 = 1.888888889
0.5555555556b + b2 = 1.888888889

The b term is 0.5555555556b.  Take half its coefficient (0.2777777778).
Square it (0.07716049384) and add it to both sides.

Add '0.07716049384' to each side of the equation.
0.5555555556b + 0.07716049384 + b2 = 1.888888889 + 0.07716049384

Reorder the terms:
0.07716049384 + 0.5555555556b + b2 = 1.888888889 + 0.07716049384

Combine like terms: 1.888888889 + 0.07716049384 = 1.96604938284
0.07716049384 + 0.5555555556b + b2 = 1.96604938284

Factor a perfect square on the left side:
(b + 0.2777777778)(b + 0.2777777778) = 1.96604938284

Calculate the square root of the right side: 1.402158829

Break this problem into two subproblems by setting 
(b + 0.2777777778) equal to 1.402158829 and -1.402158829.

Subproblem 1

b + 0.2777777778 = 1.402158829 Simplifying b + 0.2777777778 = 1.402158829 Reorder the terms: 0.2777777778 + b = 1.402158829 Solving 0.2777777778 + b = 1.402158829 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.2777777778' to each side of the equation. 0.2777777778 + -0.2777777778 + b = 1.402158829 + -0.2777777778 Combine like terms: 0.2777777778 + -0.2777777778 = 0.0000000000 0.0000000000 + b = 1.402158829 + -0.2777777778 b = 1.402158829 + -0.2777777778 Combine like terms: 1.402158829 + -0.2777777778 = 1.1243810512 b = 1.1243810512 Simplifying b = 1.1243810512

Subproblem 2

b + 0.2777777778 = -1.402158829 Simplifying b + 0.2777777778 = -1.402158829 Reorder the terms: 0.2777777778 + b = -1.402158829 Solving 0.2777777778 + b = -1.402158829 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.2777777778' to each side of the equation. 0.2777777778 + -0.2777777778 + b = -1.402158829 + -0.2777777778 Combine like terms: 0.2777777778 + -0.2777777778 = 0.0000000000 0.0000000000 + b = -1.402158829 + -0.2777777778 b = -1.402158829 + -0.2777777778 Combine like terms: -1.402158829 + -0.2777777778 = -1.6799366068 b = -1.6799366068 Simplifying b = -1.6799366068

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.1243810512, -1.6799366068}

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