Multiply
(4r+4)(4r-4)
use the FOIL method.
multpily the the first number to the First numbr then to the Outside then multiply the Inside numbers then the Last.
you get 16r^2 - 16r + 16r - 16
which equals 16r^2 -16
(4r+4)(4r-4)
multpily the the first number to the First numbr then to the Outside then multiply the Inside numbers then the Last.
you get 16r^2 - 16r + 16r - 16
which equals 16r^2 -16