Jawablah Pertanyaan dibawah Ini!

› Nomor 1

Jika f(x) = x – 2, maka f(3) = ….

Jawab:

f(x) = x – 2

f(3) = 3 – 2

f(3) = 1

› Nomor 2

Jika f(x) = x² – 3x + 2 dan g(x) = 4x + 1, maka (g o f)(x) = ….

Jawab:

(g o f)(x) = g (f(x))

ㅤㅤㅤㅤ= g (x² – 3x + 2)

ㅤㅤㅤㅤ= 4(x² – 3x + 2) + 1

ㅤㅤㅤㅤ= 4x² – 12x + 8 + 1

ㅤㅤㅤㅤ= 4x² – 12x + 9

No. 1

f(x) = x – 2

f(3) = 3 – 2

f(3) = 1

No. 2

f(x) = x² – 3x + 2

g(x) = 4x + 1

(gof)(x) ?

jawab :

= (gof)(x)

= g(f(x))

= 4(x² – 3x + 2) + 1

= 4x² – 12x + 8 + 1

= 4x² – 12x + 9