Question

If f(x) = x-4 / x+4 , then f(4a) equals what ?

Answer 1

what are your ideas about this?

Answer 2

replace "x" in the equation by "4a" just like the other ones :)

Answer 3

replace x with 4a so you'll have:

f(4a) = 4a-4/ 4a+4
= 4(a-1)/ 4(a+1)

Answer 4

THANK YOU!!!

Answer 5

np :)