Question

The limit
limh→0(6+h)2−36/h
represents the derivative of some function f(x) at some number a. Find f and a.

Answer 1

((f(x+h)-f(x))/h
f(x)=x^2
x=6
so
(((x+6)^2-36)/h
it's drivation formules so
f(x)'=2x
f(6)'=12

Answer 2

and what A will be

Answer 3

i think a is 6
x=a=6

Answer 4

thx