Diketahui:
g(x) = x²-1
(fog)(x) = x⁴-4x²
Ditanyakan:
f(11)
Jawab:
(fog)(x) = f(g(x))
x⁴-4x² = f(x²-1)
misal x²-1 = a
maka
x²-1 = a
x² = a+1
x = √(a+1)
f(a) = (√(a+1))⁴-4(√(a+1))²
= (a+1)²-4(a+1)
f(11) = (11+1)²-4(11+1)
= 12²-4(12)
= 144-48
= 96
Mapel: Matematika
Kelas: 10
Materi: Komposisi Fungsi
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Diketahui:
g(x) = x²-1
(fog)(x) = x⁴-4x²
Ditanyakan:
f(11)
Jawab:
(fog)(x) = f(g(x))
x⁴-4x² = f(x²-1)
misal x²-1 = a
maka
x²-1 = a
x² = a+1
x = √(a+1)
f(a) = (√(a+1))⁴-4(√(a+1))²
= (a+1)²-4(a+1)
f(11) = (11+1)²-4(11+1)
= 12²-4(12)
= 144-48
= 96
Mapel: Matematika
Kelas: 10
Materi: Komposisi Fungsi