Math, asked by shahid676, 1 year ago

use the product (a+b) (a-b)=a2-b2 to evaluate 21×19

Answers

Answered by suramanksc2017

7

(20+1) (20-1)

=20² - 1²

=400-1

=399

Hope it helps...

suramanksc2017: you can follow me whenever in need in future

shahid676: wrong h

suramanksc2017: my ans is correct

suramanksc2017: bhai calculator use karke bhi dekh sakta hai

Answered by prachi7255

0

21^2-19^2

441-361

(441+361)(441-361)

hope it help

shahid676: wrong

prachi7255: which is correct ans

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