b^2-b-6=8

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Solution for b^2-b-6=8 equation:


Simplifying
b2 + -1b + -6 = 8

Reorder the terms:
-6 + -1b + b2 = 8

Solving
-6 + -1b + b2 = 8

Solving for variable 'b'.

Reorder the terms:
-6 + -8 + -1b + b2 = 8 + -8

Combine like terms: -6 + -8 = -14
-14 + -1b + b2 = 8 + -8

Combine like terms: 8 + -8 = 0
-14 + -1b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -1b + 14 + b2 = 0 + 14

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

Combine like terms: -14 + 14 = 0
0 + -1b + b2 = 0 + 14
-1b + b2 = 0 + 14

Combine like terms: 0 + 14 = 14
-1b + b2 = 14

The b term is -1b.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1b + 0.25 + b2 = 14 + 0.25

Reorder the terms:
0.25 + -1b + b2 = 14 + 0.25

Combine like terms: 14 + 0.25 = 14.25
0.25 + -1b + b2 = 14.25

Factor a perfect square on the left side:
(b + -0.5)(b + -0.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(b + -0.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

b + -0.5 = 3.774917218 Simplifying b + -0.5 = 3.774917218 Reorder the terms: -0.5 + b = 3.774917218 Solving -0.5 + b = 3.774917218 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + b = 3.774917218 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + b = 3.774917218 + 0.5 b = 3.774917218 + 0.5 Combine like terms: 3.774917218 + 0.5 = 4.274917218 b = 4.274917218 Simplifying b = 4.274917218

Subproblem 2

b + -0.5 = -3.774917218 Simplifying b + -0.5 = -3.774917218 Reorder the terms: -0.5 + b = -3.774917218 Solving -0.5 + b = -3.774917218 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + b = -3.774917218 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + b = -3.774917218 + 0.5 b = -3.774917218 + 0.5 Combine like terms: -3.774917218 + 0.5 = -3.274917218 b = -3.274917218 Simplifying b = -3.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. b = {4.274917218, -3.274917218}

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