Question

Could you please help me with inverse functions?

If

f (x) = 3x + 1 and f times -1 squared = x - 1 / 3

then the ordered pair of f(3) =


(3, 10)
(3, 2/3)
(10, 3)
I thought 10, 3.. I got five other problems like this wrong, and only three correct!

Answer 1

It can't be (10,3) because f(3) implies that x = 3, so the coordinates must be \((3, f(3))\)

Answer 2

And it looks to me like f(3) = 10, so the coordinates should be (3,10)

Answer 3

ok...