If = -1, then a³-b³ =

18

=

19

The product (a+b) (a-b) (a²-ab+b²) (a²+ab+b²) is equal to

21

The product (x²-1) (x⁴+x²+1) is equal to=

22

If a-b=-8, and ab =-12, then a³ – b³ =