Question

Jika f(xy)= f(x+y) dan f(7)=7. tentukanlah nilai f(49)

Answer 1

f (xy) = f (x + y)
f (7) = 7


f (49) = f (7 .7)
          = f (7 + 7)
          = f (7 . 2)
         = f (7 + 2)
         = f (3 . 3)
         = f (3 + 3)
        =  f (6)
        = f (6 + 1)
         = f (7)
        = 7