Question

using identities solve 78 × 82 plz answer it

Answer 1

78×82 = (80-2)(80+2)
We know , (a-b)(a+b) = a²-b²
80²-2² = 6400-4 = 6396

Answer 2

Hi ,

******************"*************
We know the algebraic identity ,

( x - y ) ( x + y ) = x² - y²

***********************************

78 × 82

= ( 80 - 2 ) ( 80 + 2 )

= ( 80 )² - ( 2 )²

= 6400 - 4

= 6396

I hope this helps you.

:)