HSC 2020 (1 Viewer)

[krypticlemonjuice]

How do we do this question?? I don't understand the solution, particularly the expression they derived for PR.

Can someone please show me how to do this question??

 

[SadCeliac]

btw think of PR as PO + OR = r - p

 

[krypticlemonjuice]

btw think of PR as PO + OR = r - p

then why did they write p-r ??

 

[krypticlemonjuice]

I think it makes more sense if you see the whole question and solution
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I don't get why they wrote p-r for PR

 

[SadCeliac]

then why did they write p-r ??

no clue.... oops