Question

If f(x) = 7x – 12, what is f–1(x) ?

) x-12 / 7
2) x+12 / 7
3) x+7 / 12
4) x-7 / 12

Answer 1

Let y = 7x - 12
7x = y + 12
x = (y + 12)/7

Therefore, f^-1(x) = (x + 12)/7