Question

Using identities, find the square of the following numbers.

(ii) 73​

Answer 1

To find : Square of "73" using suitable identity

Answer :

First splitting the number "73"

We can expand it so we get (70+3)

Now using the identity

(a+b)^2 = a^2+b^2+2ab

(70+3)^2 = (70)^2+(3)^2+2(70)(3)

(70+3)^2= 4900+9+420

(70+3)^2 = 5329

Answer 2

73

= (70+3)²

= (70)²+2×70×3+(3)²

= 4900+420+9

= 5,329

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