(x+6)^2=?
(3a-1)^2=?
(3y-2)(3y+2)=?
(4a+3k )(4a-3k)=*?

(x+6)^2=x²+12x+36(3a-1)^2=9a²-6a+1(3y-2)(3y+2)=9y²+6y-6y-4=9y²-4(4a+3k)(4a-3k)=16a²-12ak-12ak-9k²==16a²-9k²