Question

find the derivative of the function, we will use the formula
f '(x) = lim
h→0 f(x + h) − f(x)
h
.For f(x) = 1
4
x − 1
9

Answer 1

f(x) = 4x −19

f'(x) = 4

Answer 2

If I am reading your question correctly, the attached picture works out its answer...

Answer 3

if you wanna test that:

just plug in (x+h) for x and go at it :)

Answer 4

you read it right :)