Find the products   
(i) (2a + 5b)(4a2 - 10ab + 25b2)
(ii) (2a - 5b)(4a2 + 10ab + 25b2)
(i) (2a + 5b)(4a2 - 10ab + 25b2)
            = (2a  + 5b)[(2a)2 - (2a)(5b) + (5b)2]
            = (2a)3 + (5b)3 (from identity 10 above)
            = 8a3 + 125b3
(ii) (2a - 5b)(4a2 + 10ab + 25b2)
             = (2a - 5b)[(2a)2 + (2a)(5b) + (5b)2]
             = (2a)3 - (5b)3   (from identity 11 above)
             = 8a3 - 125b3
24