Q1 of 95 Page 79

Compute the squares of these numbers.
49

Using identity = + - 2

So =

= + - 2

= 2500 + 1- 100

= 2401

Prove that for any natural number ending in 3, its square ends in 9. What about numbers ending in 5? And numbers ending in 4?

Compute the squares of these numbers.

Questions · 95

4. Identities

1 1 1 1 1 1 2 2 2 2 2 2 3 3 4 4 1 1 1 2 2 2 2 2 2 3 3 4 4 5 5 1 1 1 1 1 1 1 1 2 2 3 3 3 3 1 1 1 1 1 1 1 1 1 1 1 1 2 2 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 1 1 1 1 2 2 2 2 3 3 3 3 1 1 1 1 1 1 1 1

Compute the squares of these numbers.49