Question

If f(x) = 5x + 3, then what is f–1(x) ?

Answer 1

you are asking for the inverse of the function correct?

Answer 2

yes, sorry about that.

Answer 3

y=5x+3 rewrite using y for f(x)
switch x and y
x=5y+3
solve for y
x=5y+3
x-3=5y
(x-3)/5=y

Answer 4

when you graph your original function with its inverse, the line of symmetry is y=x

Answer 5

so you wouldn't have to factor anything?

Answer 6

not here

Answer 7

ok, thanks. that's probably why i kept messing up.

Answer 8

just remember to switch your x and y variables and solve for y