If a + 2b = 5; then show that :

a³ + 8b³ + 30ab = 125.

If a + 2b + c = 0; then show that :

a³ + 8b³ + c³ = 6abc.

Use property to evaluate:

(i) 9³ - 5³ - 4³

(ii) 38³ + (-26)³ + (-12)³