Jika f(x + 1) = 2x – 4, maka f(x) =

Jika f(x + 1) = 2x – 4, maka f(x) = ….

Pembahasan:

f(x + 1) = 2x – 4

   x + 1 = y

   x = y – 1

f(y) = 2(y – 1) – 4

       = 2y – 2 – 4

f(y) = 2y – 6

Jadi nilai f(x) = 2x – 6

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