Question

Factorize: 9(2a – b)^2 – 4(2a – b)

Answer 1

9(2a - b)^2 - 4(2a - b)

= (2a- b) ( 18a - 9b -4)

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Answer 2

${9( 2a - b )^2 - 4( 2a - b ).}$

$={ 9( 2a - b ) ( 2a - b) - 4( 2a - b ).}$

= ( 2a - b ) {9( 2a - b ) - 4 }.

=( 2a - b )(18a - 9b - 4)