Question

Given f(x) = the quantity of x plus 7, divided by 5, solve for f−1(3).

A) −20
B) 2
C) 8
D) 10

Answer 1

The other answer is wrong

Explanation:

It should be -20. they didnt do inverse

Answer 2

Final answer is c) 8

Explanation:

GIven equation is
`f(x)=(x+7)/(5)`

Now we need to evaluate
`f^(-1)(3)`.

`f^(-1)(3)` means find the value of x for which y of f(x)=3

`f(x)=(x+7)/(5)`

`3=(x+7)/(5)`

`3*5=(x+7)/(5)*5`

`15=x+7`

`15-7=x`

`8=x`

Hence final answer is c) 8