Jika f(xy)=f(x+y)dan f(7)=7. Tentukan nilai f(49) Tolong bantu jawab

f(xy)=f(x+y) dan f(7)=7
f (7 * 1) = 7
f (7 + 1) = 7 ingat bahwa f(xy)=f(x+y)
f (8) = 7
f (8 * 1) = 7
f (8 + 1) = 7
f (9) = 7
f (9 * 1) = 7
f (9 + 1) = 7
begitu seterusnya.
f (7) = f (8) = f(9) = .... = f (49) = 7