Please help me Factor: p^2(z-r)-49(z-r)
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Please help me Factor: p^2(z-r)-49(z-r)

[From: ] [author: ] [Date: 13-02-03] [Hit: ]
... now you also have a difference of squares.........
I'm normally good at factoring, but I'm very confused. It's an online class so I can't really ask the professor for help. Can you please show me how to solve this problem?

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(z-r) is common to both terms
so p^2(z-r) - 49(z-r)
= (z-r)(p^2 - 49).... now you also have a difference of squares....
= (z-r)(p+7)(p-7)
and you are finished.

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(z-r)(p^2-49)=(z-r)(p+7)(p-7)
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