A Level Maths Binomial Expansion
I dont know what I'm doing wrong so far ive done (3-2x)^-1 then 1/3(1-2/3x)^-1 and I subbed into the formula but its incorrect

A Level Maths Binomial Expansion I dont know what Im doing wrong so far ive done 32x1 then 13123x1 and I subbed into the formula but its incorrect class=