discriminant (1 Viewer)

[muttiah]

The interval PQ has length p, and the pt A lies between the pts P and Q. Find PA when PQ x QA = PA^2

camrbduige qn 9 page 291

 

[Affinity]

let PA = x, then
p(p-x)=x^2
x>0
x<p
so you end up with
x=(sqrt(5)-1)p/2