by using identities solve this question
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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
••••
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
••••
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