Question

(4m^2-7)(4m^2+7)

Answer 1

Do you know how to foil?
4m^2*4m^2+28m^2-28m^2-49
combine like terms

Answer 2

you should get 16m^4-49, did you get that ?

Answer 3

sort of

Answer 4

(3k+4)(3k^2-5k-5)