plz answer these questions step by step the one who will answer this correctly i will mark him/her brainlist
you can attach a picture too
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Answered by
7
Answer:i) ≈ 102 × 98
≈ 102 (100 - 2)
≈ 10200 - 204
≈ 9996 ans.....
ii) ≈ (101×101)(91×91)
≈ 10,201 - 8281
≈ 1920 ans...
Answered by
1
Step-by-step explanation:
not sure what do u mean by rules of identities but here's an interesting answer
1 -
102 x 98
(100+2) x (100-2)
as (a+b) x (a-b) = a^2 - b^2
10000-4
9996
2-
101^2 - 91^2
(100 + 1)^2 - (100-9)^2
as (a+b)^2 = a^2 + b^2 + 2(ab)
and (a-b)^2 = a^2 + b^2 - 2(ab)
=>10000 + 1 + 2(100) - 10000 - 81 + 2(900)
-80+2(1000)
2000-80
=1920
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