Find the value of each of the following using the short-cut method: (84) 3

Find the value of each of the following using the short-cut method:
(84)³

Let’s take,

a = 8 and

b = 4

So, by using the formula,

We have a³+3a²b+3ab²+b³

64

X 8

64

X 12

16

X 24

16

X 4

512

+80

768

+39

384

+6

64

592

807

390

By taking the highlighted digits only,

We get;

؞(84)³ = 592704

4