b^2+8b-60=0

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Solution for b^2+8b-60=0 equation:


Simplifying
b2 + 8b + -60 = 0

Reorder the terms:
-60 + 8b + b2 = 0

Solving
-60 + 8b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 8b + 60 + b2 = 0 + 60

Reorder the terms:
-60 + 60 + 8b + b2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 8b + b2 = 0 + 60
8b + b2 = 0 + 60

Combine like terms: 0 + 60 = 60
8b + b2 = 60

The b term is 8b.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8b + 16 + b2 = 60 + 16

Reorder the terms:
16 + 8b + b2 = 60 + 16

Combine like terms: 60 + 16 = 76
16 + 8b + b2 = 76

Factor a perfect square on the left side:
(b + 4)(b + 4) = 76

Calculate the square root of the right side: 8.717797887

Break this problem into two subproblems by setting 
(b + 4) equal to 8.717797887 and -8.717797887.

Subproblem 1

b + 4 = 8.717797887 Simplifying b + 4 = 8.717797887 Reorder the terms: 4 + b = 8.717797887 Solving 4 + b = 8.717797887 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + b = 8.717797887 + -4 Combine like terms: 4 + -4 = 0 0 + b = 8.717797887 + -4 b = 8.717797887 + -4 Combine like terms: 8.717797887 + -4 = 4.717797887 b = 4.717797887 Simplifying b = 4.717797887

Subproblem 2

b + 4 = -8.717797887 Simplifying b + 4 = -8.717797887 Reorder the terms: 4 + b = -8.717797887 Solving 4 + b = -8.717797887 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + b = -8.717797887 + -4 Combine like terms: 4 + -4 = 0 0 + b = -8.717797887 + -4 b = -8.717797887 + -4 Combine like terms: -8.717797887 + -4 = -12.717797887 b = -12.717797887 Simplifying b = -12.717797887

Solution

The solution to the problem is based on the solutions from the subproblems. b = {4.717797887, -12.717797887}

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