b^2-4b-14=-1

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Solution for b^2-4b-14=-1 equation:


Simplifying
b2 + -4b + -14 = -1

Reorder the terms:
-14 + -4b + b2 = -1

Solving
-14 + -4b + b2 = -1

Solving for variable 'b'.

Reorder the terms:
-14 + 1 + -4b + b2 = -1 + 1

Combine like terms: -14 + 1 = -13
-13 + -4b + b2 = -1 + 1

Combine like terms: -1 + 1 = 0
-13 + -4b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -4b + 13 + b2 = 0 + 13

Reorder the terms:
-13 + 13 + -4b + b2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -4b + b2 = 0 + 13
-4b + b2 = 0 + 13

Combine like terms: 0 + 13 = 13
-4b + b2 = 13

The b term is -4b.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4b + 4 + b2 = 13 + 4

Reorder the terms:
4 + -4b + b2 = 13 + 4

Combine like terms: 13 + 4 = 17
4 + -4b + b2 = 17

Factor a perfect square on the left side:
(b + -2)(b + -2) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(b + -2) equal to 4.123105626 and -4.123105626.

Subproblem 1

b + -2 = 4.123105626 Simplifying b + -2 = 4.123105626 Reorder the terms: -2 + b = 4.123105626 Solving -2 + b = 4.123105626 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + b = 4.123105626 + 2 Combine like terms: -2 + 2 = 0 0 + b = 4.123105626 + 2 b = 4.123105626 + 2 Combine like terms: 4.123105626 + 2 = 6.123105626 b = 6.123105626 Simplifying b = 6.123105626

Subproblem 2

b + -2 = -4.123105626 Simplifying b + -2 = -4.123105626 Reorder the terms: -2 + b = -4.123105626 Solving -2 + b = -4.123105626 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + b = -4.123105626 + 2 Combine like terms: -2 + 2 = 0 0 + b = -4.123105626 + 2 b = -4.123105626 + 2 Combine like terms: -4.123105626 + 2 = -2.123105626 b = -2.123105626 Simplifying b = -2.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.123105626, -2.123105626}

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