2b^2-b-14=0

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Solution for 2b^2-b-14=0 equation:


Simplifying
2b2 + -1b + -14 = 0

Reorder the terms:
-14 + -1b + 2b2 = 0

Solving
-14 + -1b + 2b2 = 0

Solving for variable 'b'.

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

Divide each side by '2'.
-7 + -0.5b + b2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -0.5b + 7 + b2 = 0 + 7

Reorder the terms:
-7 + 7 + -0.5b + b2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -0.5b + b2 = 0 + 7
-0.5b + b2 = 0 + 7

Combine like terms: 0 + 7 = 7
-0.5b + b2 = 7

The b term is -0.5b.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5b + 0.0625 + b2 = 7 + 0.0625

Reorder the terms:
0.0625 + -0.5b + b2 = 7 + 0.0625

Combine like terms: 7 + 0.0625 = 7.0625
0.0625 + -0.5b + b2 = 7.0625

Factor a perfect square on the left side:
(b + -0.25)(b + -0.25) = 7.0625

Calculate the square root of the right side: 2.657536453

Break this problem into two subproblems by setting 
(b + -0.25) equal to 2.657536453 and -2.657536453.

Subproblem 1

b + -0.25 = 2.657536453 Simplifying b + -0.25 = 2.657536453 Reorder the terms: -0.25 + b = 2.657536453 Solving -0.25 + b = 2.657536453 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + b = 2.657536453 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + b = 2.657536453 + 0.25 b = 2.657536453 + 0.25 Combine like terms: 2.657536453 + 0.25 = 2.907536453 b = 2.907536453 Simplifying b = 2.907536453

Subproblem 2

b + -0.25 = -2.657536453 Simplifying b + -0.25 = -2.657536453 Reorder the terms: -0.25 + b = -2.657536453 Solving -0.25 + b = -2.657536453 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + b = -2.657536453 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + b = -2.657536453 + 0.25 b = -2.657536453 + 0.25 Combine like terms: -2.657536453 + 0.25 = -2.407536453 b = -2.407536453 Simplifying b = -2.407536453

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.907536453, -2.407536453}

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