Question

how to expand (6+1/a) (6+2/a​

Answer 1

Answer=according to identities 4

(x+a)(x+b)=x²+(a+b)x+an

,=(6+1/a)(6+2/a)

=6²+(1/a+2/a)6+1/a×2/a

=36+3/a+2/a²