Question

16c^8-64 =
___________
81d^2 - 36k^2 =
___________
(14+c) (14-c) =
___________

Answer 1

1) $16c^{8}-64=(4c^{4}-8)( 4c^{4}+8)$
2) $81d^{2} - 36k^{2} =( 9d-6k)(9d+6k)$
3) $(14+c)(14-c)=196- c^{2}$