Question

by using identities solve this question

Answer 1

Solution :

It is given that ,

a = 8 , b = 4

( 2a - 3b )²

= ( 2a )² - 2×2a×3b + ( 3b )²

= 4a² - 12ab + 9b²

Now ,

Vlaue of ( 2a - 3b )²

= [ 2×8 - 3×4 ]²

= ( 16 - 12 )²

= 4²

= 16

RHS = 4a² - 12ab + 9b²

= 4(8)² - 12(8)(4) + 9(4)²

= 256 - 384 + 144

= 400 - 384

= 16

LHS = RHS

••••