Question

(a+b)^3-8(a-b)^3 factorise it plz

Answer 1

= a³+b³+3ab(a+b)-8[a³-b³-3ab(a-b)]                       [By using identities of (a-b)³ and (a+b)³]

= a³+b³+3a²b+3ab²-8[a³-b³-3a²b+3ab²]

= a³+b³+3a²b+3ab²-8a³+8b³+24a²b-24ab²

= -7a³+9b³+27a²b-21ab²

Hope this helps......