[R] Simple Problem: Plotting mathematical functions

[Aye]

Okay, i got this far:
f <- function(x) 0.25*x^2 + 6.47*x -32.6	
g <- function(x) 0.99*x^2 -6*x -195		
h <- function(x) 0.77*x^2 +14*x -495			
j <- function(x) 0.001*x^2 + 65*x -785		
k <- function(x) 0.9*x^2 -2*x -636 
plot(x, f(x), xlab="Elemente in der Reihung", ylab="Indexwert des
Sortieraufwands"), type="l") 
// lines(x, g(x), lty=3) //Not sure if it works, but this is irrelevant atm.

As soon as R does the plot command, he states that x is an object he can't
find. 
So i propably have to do something like x <- XXXXXXXXXX. What do I insert
for the XXXXXXXXX to make it have the values - say - from 15 to 10000?

Thanks again.

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