Question

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

Answer 1

\[y=5x+3\] Solve for x.

Answer 2

What do you get?

Answer 3

Hello?

Answer 4

-3/5?

Answer 5

start with

\[x = 5y + 3\]

to find the inverse make y the subject

Answer 6

5y=3-x

Answer 7

not quite

x - 3 = 5y

now divide both sides by 5

Answer 8

1x/5-3/5=y

Answer 9

thats correct... or

y = (x -3)/5

Answer 10

so is that the answer?

Answer 11

yep... thats the inverse...

Answer 12

ok. thanks can you hall me with a word problem

Answer 13

if you post it in the normal way I'll look at it... there are lots of people who can help

Answer 14

ok