Find the value of each of the following using the short-cut method:
(68)3
Let’s take,
a = 6 and
b = 8
So, by using the formula,
We have a3+3a2b+3ab2+b3
36 X 6 | 36 X 24 | 64 X 18 | 64 X 8 |
216 +98 | 864 +120 | 1152 +51 | 512 |
314 | 984 | 1203 |
By taking the highlighted digits only,
We get;
؞(68)3 = 314432