Question

If f(x) = 8x + 5, what is f(x)^-1?

Answer 1

swap x and y

x = 8y + 5

now may y the subject to find the inverse

Answer 2

http://www.purplemath.com/modules/invrsfcn3.htm

Answer 3

x/8 -5?

Answer 4

almost

\[f^{-1}(x) = \frac{x - 5}{8}\]

Answer 5

i am pretty sure that is right

Answer 6

subtract 5 as the 1st step...

then divide by 8

Answer 7

gotcha. Thank you!

Answer 8

for any inverse... start by swapping x and y...

then make y the subject

and glad to help