The greatest common factor of the binomial 3 x 9 3x9 is 3 3

The greatest common factor of the binomial 3 x 9 3x-9 is 3 3. The greatest common factor of the binomial 4 x 12 is 4. What is the greatest common factor of their product, ( 3 x 9 ) ( 4 x 12 ) , when it has been multiplied out? Preview \\

We have 3 x – 9 = 3(x-3) and 4 x – 12= 4(x-3). Therefore, (3x-9)( 4x-12) = 3(x-3)* 4(x-3) =12(x-3)² . Apparently, the greatest common factor is 12.