3b^2-6b-16=0

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Solution for 3b^2-6b-16=0 equation:


Simplifying
3b2 + -6b + -16 = 0

Reorder the terms:
-16 + -6b + 3b2 = 0

Solving
-16 + -6b + 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'.
-5.333333333 + -2b + b2 = 0

Move the constant term to the right:

Add '5.333333333' to each side of the equation.
-5.333333333 + -2b + 5.333333333 + b2 = 0 + 5.333333333

Reorder the terms:
-5.333333333 + 5.333333333 + -2b + b2 = 0 + 5.333333333

Combine like terms: -5.333333333 + 5.333333333 = 0.000000000
0.000000000 + -2b + b2 = 0 + 5.333333333
-2b + b2 = 0 + 5.333333333

Combine like terms: 0 + 5.333333333 = 5.333333333
-2b + b2 = 5.333333333

The b term is -2b.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2b + 1 + b2 = 5.333333333 + 1

Reorder the terms:
1 + -2b + b2 = 5.333333333 + 1

Combine like terms: 5.333333333 + 1 = 6.333333333
1 + -2b + b2 = 6.333333333

Factor a perfect square on the left side:
(b + -1)(b + -1) = 6.333333333

Calculate the square root of the right side: 2.516611478

Break this problem into two subproblems by setting 
(b + -1) equal to 2.516611478 and -2.516611478.

Subproblem 1

b + -1 = 2.516611478 Simplifying b + -1 = 2.516611478 Reorder the terms: -1 + b = 2.516611478 Solving -1 + b = 2.516611478 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = 2.516611478 + 1 Combine like terms: -1 + 1 = 0 0 + b = 2.516611478 + 1 b = 2.516611478 + 1 Combine like terms: 2.516611478 + 1 = 3.516611478 b = 3.516611478 Simplifying b = 3.516611478

Subproblem 2

b + -1 = -2.516611478 Simplifying b + -1 = -2.516611478 Reorder the terms: -1 + b = -2.516611478 Solving -1 + b = -2.516611478 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = -2.516611478 + 1 Combine like terms: -1 + 1 = 0 0 + b = -2.516611478 + 1 b = -2.516611478 + 1 Combine like terms: -2.516611478 + 1 = -1.516611478 b = -1.516611478 Simplifying b = -1.516611478

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.516611478, -1.516611478}

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