Now sure how to get to answer:
A quadratic function, f, has zeros P and Q such that P+Q=5 and (1/P)+(1/Q)=8. What function would best describes f?

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so you have sum of roots
find product of roots PQ from
(1/P)+(1/Q)=8.
can u ?

Okay so I assume I use substitution here?

you can, yes.
but see this :
1/P + 1/Q =8
(Q+P)/PQ = 8
we know P+Q = 5
so,
5/(PQ) = 8
got this ?

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