Error measurement?

Question

I have a formula that I would like to find the propagated error from: n = (c) (p x a^2)/v, c= constant, and p, a, and v are variables.
This is generalized to the form:
X = c (A x B^2)/C, where c = constant, and A,B,C are variables
I know c, A, B, C, delta A, B, C, X, and delta X; so I basically know all the variables in this problem. How would I go about finding the propagated error?
Wikipedia gives:
If X = c(A*B)/C, where c is constant and A, B, C are variables
((DX)/X)^2 = (DA/A)^2 + (DB/B)^2 + (DC/C)^2
But I have a B^2 term in there; how would I go about finding the error?

Answer 1

You are on the right track.
Go back to wiki and just look a bit below the equation you already have found. I'm referring to the one with computing error in resistance from measured values of current and voltage.

R- in a nominal expected value (say 100 k ohms)
dR - is the propagated error ( to be computed)