Question

Find dy/dx at x=0

y= (1/(-3+u^2)), u = 2x+1

a) -4
b) 0
c) -2
d) -1
e) 1

Answer 1

you have a choice
you can find
\[\frac{dy}{du}[\frac{1}{-3+u^2}]\] and then replace \(u\) by 1, when multiply by the derivative of \(2x+1\) which is 2
or you can replace \(u\) by \(2x+1\) and compute the derivative of that one

Answer 2

i meant "replace \(u\) by 0, not 1, sorry

Answer 3

So it doesn't matter if i put u in the equation then find the derivative OR i can find the derivative and then plug in u, correct?