Mathematics for IGCSE & O level - Functions (Section 1 - No. 25)

If f(x) = 3x - 5, then what is f^-1(7)?

2/3

4

16/3

26

Shpjegimi

First find f^-1(x). Swap x and y, then y = (x+5)/3. f^-1(7) = (7+5)/3 = 4

Komentet (0)

Reklamim