Question

using identities :express (72)^2-(18)^2

Answer 1

a

${a - b}{a + b} = {a}^{2} - {b}^{2}$
(72+18)(72-18)
(90)(54)
4860

Answer 2

Hey my friend.....

The identity which must be used here is :
( a + b ) ( a - b ) = a^2 - b^2

Here

a = 72
b = 18

72^2 - 18^2 =
( 72 - 18 ) ( 72 + 18 ) = ( 54)(90) = 4860

Hope it helps u
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