Question

solve for b: (remember: b^2 equals b to the second power-"exponent")

b^2 = 8b + 84

Answer 1

b^2 -8b - 84 = 0
b^2 - 14b + 6b - 84 = 0

now factor by grouping

Answer 2

b(b-14)+6(b-14)............= (b-14)(b+6)
(b-14)=0..........................or((b+6)=0
b=14...............or b= -6