Find the following by using The identities.
1. 52² - 47²
2. 28 × 32
3. 1001²
4. 501²
Answers
Answered by
0
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
= 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
Similar questions