Question

plzz I need explaination not the answer....​

Answer 1

Calculating square of any number is easy by doing multiplication but when u go to higher numbers like 21 etc in which multiplication is big and also difficult so u can break them in smaller form like you can write 21 as 20+1 and by using the formula (a+b)^2 as a^2+b^2+2ab

And by using this u can find the answer easily

Hope helps

Answer 2

Answer:

are isme dono square nikal kar jiska bada ho usse chota subract kar ke or uske baad jo aaye usme 1 or subtract karna hai aa jaye ga anser