Calculus
posted by Michelle on .
Using the derivative definition of f ‘ (x) = (f (x+h) – f (x)) / (h) find the derivatives of the following…
1. f(x) = (2x1) / (x+2)
2. f(x) = sqrt (3x1)
3. f(x) = 3x^4
my answers were:
1. –x+3
2. (3) / [2(sqrt(3x1))]
3. 12x^3
are my answers right?

for the first one, I got 5/(x+2)^2
the other two are correct