{-# LANGUAGE UndecidableInstances #-}
Ouch!
Don't worry, it's just me not liking UndecidableInstances.
So instead of passing the parameters as a list I want to pass them as
arguments:
\x p1 p2 p3 -> p1*x^2 + p2*x + p3
Why not use tuples?
\x (p1, p2, p3) -> p1 * x^2 + p2 * x + p3
Or a special list-like data type
data a :* b = ($*) a b
func :: Double -> (Double :* Double :* Double) -> Double
func x (p1 $* p2 $* p3) = p1 * x^2 + p2 * x + p3
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