Question

Which of the following is the difference between the squares of 21 and 22?
(i) 21
(ii) 22
(iii) 42
(iv) 43

Answer 1

21^2=441
22^2=484
hence,484-441=43
the correct answer is (4)

Answer 2

Answer:

The difference between the squares of 21 and 22 is equal to 43.

Step-by-step explanation:

Square of 21 is equal to $=21^{2}=441$

Square of 22 is equal to $=22^{2}=484$

The difference between squares of 21 and 22 $=484-441=43$

Therefore the option (iv) is correct.