Question

Identify a function f and a point
x = a for which the given limit represents
f '(a).

lim x→−4 (sqrt. (29 + x) -x) / (x+4)
f(x)= ?
a=?

Answer 1

f'(a) = lim as x-> a (f(x+a) - f(x))/h

Answer 2

i meant:
f'(a) = lim as x-> a (f(x+a) - f(x))/a

Answer 3

so when they ask for f(x) i put in f(a)?

Answer 4

http://www.math.hmc.edu/calculus/tutorials/limit_definition/

Answer 5

a = -4

Answer 6

hmm im kinda lost