Easy factoring problem .I think

[trap101]

Easy factoring problem...I think

Hi,

So I'm working through how to do RSA encoding, but I've stumbled on something very simple in terms of factoring. All I pretty much want to know is:

How do I factor: pq-p-q+1

To get: (p-1)(q-1)

Expanding it isn't the problem...what little trick am I missing.

Thanks

 

[SammyS]

Hi,

So I'm working through how to do RSA encoding, but I've stumbled on something very simple in terms of factoring. All I pretty much want to know is:

How do I factor: pq-p-q+1

To get: (p-1)(q-1)

Expanding it isn't the problem...what little trick am I missing.

Thanks

Factor p from the first two terms. Factor -1 from the last two terms.

 

[trap101]

***Head slap***...smh. Thanks.