Question

How do I solve this?

Answer 1

Answer:
`(4s^2 -56s+196)/(\pi)`

Explanation:

`P=4s \implies C+4s=28\\\\\implies C=28-4s\\\\\implies r=(28-4s)/(2\pi)=(14-2s)/(\pi)\\\\\therefore f(s)=\pi \left((14-2s)/(\pi) \right)^2\\\\=\pi \cdot (196+4s^2 -56s)/(\pi^2)\\\\=(4s^2 -56s+196)/(\pi)`