Question

90²-10² solve by using suitable identity
​

Answer 1

Answer:

Using identity, (a+b) (a-b)=a^2-b^2

a=90, b=10

(90+10) (90-10)

(100) (80)

8000

Answer 2

90²-10²

By using the identity a² – b² = (a + b)(a – b), we get :

90²-10² = (90+10)(90-10)

= 100×80

= 8000