Question

using the identity
(a-b)^2 = a^2 - 2ab + b^2

find 99^2

please help me with this


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Answer 1

(100-1)square = 100^2 + 1square - 2(100)

= 10000 + 1 - 200

= 10001 - 200

= 9801

hope it helps you ☺