1.

Find the following by using The identities.1. 52² - 47²2. 28 × 323. 1001²4. 501²

Answer» 1- (52+47) (52-47)
= 99×5
= 465
2- 28×32
= (30-2) (30+2)
= 30^2 - 2^2
= 900-4
= 896

3- 1001^2
= (1000+1)^2
= 1000^2 + 1^2+ 2×1000×1
= 1000000+1+2000
=1002001

4- (501)^2
= 500^2+1^2+2×500×1
=250000+1+1000
=251001


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