plz help me with these questions.
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see in 5th
103^2. can be written as (100 + 3)^2
so use formula (a+b)^2 = a^2 + 2ab + b^2
91 × 89 = (90 + 1) (90 - 1)
a^2 - b^2 =(a-b) ( a +b)
90^2 - 1^2 = 8100 - 1 = 8099
103^2. can be written as (100 + 3)^2
so use formula (a+b)^2 = a^2 + 2ab + b^2
91 × 89 = (90 + 1) (90 - 1)
a^2 - b^2 =(a-b) ( a +b)
90^2 - 1^2 = 8100 - 1 = 8099
muskanrajput40:
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