Answer:
284
Step-by-step explanation:
(15a^4 - 30a^5 )/5a^2
= 5a^2(3a^2 - 6a^3) / 5a^2
= 3a^2 - 6a^3
or
= - 6a^3 + 3a^2
Product: 787 = 1 x 787 = 787
Largest sum: 1 + 787 = 788