Question

Colum method (58) power 2

Answer 1

Step-by-step explanation:

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

(a + b)3 = a3 + 3a2b + 3ab2 + b3

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

Example:

1) 323, so here the two digits are 3 and 2.

2) 463, two digits are 4 and 6.

Answer 2

Answer:

Given number =52

By using column method we have.

∴a=5 and b=2

     a2   (2×a×b)       b2    25        204   +2           +0=27    =20⇒522=2704

Steps involved in solving column method:

Step 1: Make three columns headed by a2,2×a×b and b2 respectively. Write the values of a2,2×a×b and b2 in columns respectively.

Step 2: In the third column underline the unit digits of b2 i.e 4 and carry the tens digit of it i.e. 0 to the second column and add it to the value of the second column is 2×a×b and it will remain 20 if it added to 0.

Step 3: In column second, underline the unit digit of the number obtained in the second step i.e. 0 and carry over the tens digit of it to the first column and add it to the value of a2 i.e. 25+2=27

Step 4: Now underline the number obtained in the third step in the first column i.e. 27. The underlined digits give the required square number.