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

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

Jawaban
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