Question

find the product by suitable identity (a+3) (a-3) (a-9)

Answer 1

(a+b)(a-b)=a²-b²

(a+3)(a-3)(a²+9)

=(a²-3²)(a²+9)

=(a²-9)(a²+9)

=$a^{4} -81$

Answer 2

I hope this will help you