Question

find the product (a2-9)40

Answer 1

if your question is {(a^2)-9}40

then solution is

{(a+3)(a-3)}40

(a+3)40a-120

(40a^2)+120a-120a-360

(40a^2)-360

i hope this much will help you 

and by written question, the answer is 

80a-360