Trouble using while loops

Give the following function

f(x)= x^3 -(5x)^2 +2^(x) - 10000x

Use a while loop to compute f(x) and then create a plot for 0<x<20.

This is what I have so far, I know I have to define x but I don't know what to set x= to since it did not specify.

f(x)=x^3 -(5*x)^2 +2^(x) -10000*x;

while 0<x<20

end

[Geoff Hayes]

Leora - your question seems like homework, so I will just give a hint. You know that x is greater than zero and less than twenty. You will need to choose a step size for x and iterate with the while loop conditioning on x being less than 20. Within the loop you will compute f(x) and increment x with the step size.