Question

plzzz help me. use suitable identities evaluate: (42) 3 - (18) 3 -(24) 3

Answer 1

i hope this will usful to u

Answer 2

Answer:

(42)³- (18)³- (24)³

Let x = 42 , y = (-18) , z = (-24)

Now,    x + y + z = 42 - 18 - 24 = 0

∴ x³ + y³ + z³ = 3xyz

                     = 3 (48) (-18) (-24)

                     = 54432