1. The problem statement, all variables and given/known data Okay so here's the background. g=(4pi^2/T^2)l The instructions are: Estimate the uncertainty in g using the uncertainty propagation for a general function. The specific formula you should obtain for delta g is: #1 Δg= g (sqrt(Δl/l)^2 + (2 ΔT/T)^2) The uncertainty equation is : #2 ΔF=(sqrt (partial derivative of x)^2( Δx)^2 + (partial derivative of y)^2( Δy)^2) So basically, make equation #2 look like #1, and solve for delta g. So the question is, how do I simplify equation #2 to look like equation #1. F=g , x=l, and y=T is those equations. 2. Relevant equations g=(4pi^2/T^2)l #1 Δg= g (sqrt(Δl/l)^2 + (2 ΔT/T)^2) #2 ΔF=(sqrt (partial derivative of x)^2( Δx)^2 + (partial derivative of y)^2( Δy)^2) 3. The attempt at a solution I know the derivatives of g in relation to l and T. The professor said something about using the derivatives and replacing g into the second equation, then factoring that g out, which is how equation #1 has a g in front of the square root. I can do that with the derivative of T, however Im left with a -2 instead of a positive 2. Im missing a l for the deriative of l (obviously), so I don't really know where to go from there.