Question

If   f(x) = 7 x +12, what is f-1(x) (the inverse function)? 



a.  (x-12)/7 



b.  7x+12 



c.  1/(7x+12) 



d.  no inverse exists

Answer 1

Answer:

f(x) = 7x +12

let f(x) = y

y-12 = 7x

y-12 /7 = x

replace y with x and x with y

(x - 12)/7 = y

y = f-1(x) so,

f-1(×) = (x-12 )/7

option a is correct