Question

expansion please and fast

Answer 1

Hi friend !

(a-1/a)^3

(a^2-1)^3/a^3

a^6-1-3a(a^2-1)/a^3

Answer 2

(a-b)³=(a-b)²(a-b)

(a-b)³=(a²-2ab+b²)(a-b)

(a-b)³=a³-a²b-2a²b+2ab²+ab²-b³

(a-b)³=a³-3a²b+3ab²-b³

(a-b)³=a³-3ab(a-b)-b³