Question

Given the function f(x) = 3x, find the value of f−1(27).
f−1(27) = 1
f−1(27) = 3
f−1(27) = 9
f−1(27) = 81

Answer 1

if y = 3x, then we can switch x and y to find the inverse

x = 3y

solve for y again

Answer 2

v.v I didn't notice that you commented on here sorry

Answer 3

I don't understand v.v

Answer 4

f(x)=27 when x=9. The point is then (9, 27). If we switch places with x and y, we get (27, 9).

f-1(27) = 9