how do you factorise a sum like this? x^2y -3xy +3xz^2 -9z^2 can someone explain it to me? thanks a lot!

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Originally Posted by shuping how do you factorise a sum like this? x^2y -3xy +3xz^2 -9z^2 can someone explain it to me? thanks a lot! You have, Thus, Thus,

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