Question

expand the following (3a-7b)^2​

Answer 1

Step-by-step explanation:

( 3a - 7b )² .

[ Rule :- ( x - y )² = x² + y² - 2xy . ]

= ( 3a )² + ( 7b )² - 2 ( 3a )(7b) .

= 9a² + 49b² - 42ab .

Answer 2

( 3a - 7b )²

[ Rule :- ( x - y )² = x² + y² - 2xy ]

= ( 3a )² + ( 7b )² - 2 ( 3a )(7b)

= 9a² + 49b² - 42ab