Question

find cube of 84 using column method with diagram ​

Answer 1

For finding the cube by column method use the following formula:-

(a + b) 3 = a 3 + 3a 2 b + 3ab 2 + b 3

In this method, first find the 2 digits of a number.

Example:

1) 32 3 , so here the two digits are 3 and 2.

2) 46 3 , two digits are 4 and 6.

Examples:-

1) Find 24 3 .

Solution: Here two digits are 2 and 4.

a = 2, and b = 4. By using the column-method