Question

Using the identity a²-b² = (a-b)(a+b) , find 71²-29²
​

Answer 1

Answer:

4200

Step-by-step explanation:

Sometimes the identities are not given so we have to remember.

In the question a = 71

b = 29

then (a+b)(a-b) = (71+29)(71-29)

= 100×42

= 4200

Hope you have understood:)

Just some easy calculations!

Answer 2

Answer:

71²-29²

Step-by-step explanation:

by using the identity a²-b²=(a+b)(a-b)

where a=71

b=29

(71+29)(71-29)

100×42

4200