Question

(91)^2 simply by using identities

Answer 1

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Answer 2

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Hey

Here is your answer,

(91)^2 = (100-9)^2

(100-9)^2 is in the form of (a-b)^2

So, (a-b)^2 = a^2 + b^2 - 2an

a = 100 , b = 9

(100-9)^2 = (100)^2 + (9)^2 - 2(100)(9)

= 10000 + 81 - 1800

= 8281

Hope it helps you!