Question

expand each of the following ,using suitable identities (2a-3b)3

Answer 1

hi!!

here's ur answer...

we will use ( a - b )³ identity.

that is :-

( a - b )³ = a³ - b³ - 3a²b + 3ab²

in ( 2a - 3b )³, a = 2a and b = 3b

= (2a)³ - (3b)³ - 3 (2a)² (3b) + 3 (2a) (3b)²

= 8a³ - 27b³ - 36a²b + 54ab²

hope this helps..!!

Answer 2

(2a-3b)^3
=(2a)^3 - 3(2a)^2(3b) + 3(2a)(3b)^2 - (3b)
=8a^3 - 36a^2b + 54ab^2 - 27b^3

Hope it helps..
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