3b^2-15b-35=0

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Solution for 3b^2-15b-35=0 equation:


Simplifying
3b2 + -15b + -35 = 0

Reorder the terms:
-35 + -15b + 3b2 = 0

Solving
-35 + -15b + 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'.
-11.66666667 + -5b + b2 = 0

Move the constant term to the right:

Add '11.66666667' to each side of the equation.
-11.66666667 + -5b + 11.66666667 + b2 = 0 + 11.66666667

Reorder the terms:
-11.66666667 + 11.66666667 + -5b + b2 = 0 + 11.66666667

Combine like terms: -11.66666667 + 11.66666667 = 0.00000000
0.00000000 + -5b + b2 = 0 + 11.66666667
-5b + b2 = 0 + 11.66666667

Combine like terms: 0 + 11.66666667 = 11.66666667
-5b + b2 = 11.66666667

The b term is -5b.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5b + 6.25 + b2 = 11.66666667 + 6.25

Reorder the terms:
6.25 + -5b + b2 = 11.66666667 + 6.25

Combine like terms: 11.66666667 + 6.25 = 17.91666667
6.25 + -5b + b2 = 17.91666667

Factor a perfect square on the left side:
(b + -2.5)(b + -2.5) = 17.91666667

Calculate the square root of the right side: 4.232808367

Break this problem into two subproblems by setting 
(b + -2.5) equal to 4.232808367 and -4.232808367.

Subproblem 1

b + -2.5 = 4.232808367 Simplifying b + -2.5 = 4.232808367 Reorder the terms: -2.5 + b = 4.232808367 Solving -2.5 + b = 4.232808367 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + b = 4.232808367 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + b = 4.232808367 + 2.5 b = 4.232808367 + 2.5 Combine like terms: 4.232808367 + 2.5 = 6.732808367 b = 6.732808367 Simplifying b = 6.732808367

Subproblem 2

b + -2.5 = -4.232808367 Simplifying b + -2.5 = -4.232808367 Reorder the terms: -2.5 + b = -4.232808367 Solving -2.5 + b = -4.232808367 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + b = -4.232808367 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + b = -4.232808367 + 2.5 b = -4.232808367 + 2.5 Combine like terms: -4.232808367 + 2.5 = -1.732808367 b = -1.732808367 Simplifying b = -1.732808367

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.732808367, -1.732808367}

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