Question

991×1009 by algebraic identities​

Answer 1

Step-by-step explanation:

991×1009

= ( 1000- 9) ( 1000+ 9)

= ( 1000)^2 - ( 9)^2

= 1000000 - 81

= 999919

HOPE IT HELPS...PLEASE MARK BRAINLIST

Answer 2

Answer:

Hi mate.

Step-by-step explanation:

Using identity...

991 = 1000 - 9

10009 = 1000 + 9

So (1000 - 9)(1000 + 9)

we can write (a-b)(a+b) = a2 - b2

So ==>> 1000^2 - 9^2 = 1000000 - 81 = 999919

Hope this helps