Soal Ujian Matematika IPS Kelas 12
Tahun 2018Soal Pilihan Ganda
4. Diketahui fungsi f(x) = 8x - 2 dan g(x) = x2 - x - 6. Manfaat komposisi (f o g) (x) yakni ...
A. (f o g) (x) = 8x2 - 8x - 48
B. (f o g) (x) = 8x2 - 8x + 48
C. (f o g) (x) = 8x2 - 8x - 50
D. (f o g) (x) = 8x2 - 8x + 50
E. (f o g) (x) = 8x2 + 8x - 50
Jawaban : C
(f o g) (x) = f (g(x) )
f (x) = 8x - 2
f (g(x) ) = 8 g(x) - 2
f (g(x) ) = 8 (x2 - x - 6) - 2
f (g(x) ) = 8x2 - 8x - 48 - 2
f (g(x) ) = 8x2 - 8x - 50
(f o g) (x) = f (g(x) )
f (x) = 8x - 2
f (g(x) ) = 8 g(x) - 2
f (g(x) ) = 8 (x2 - x - 6) - 2
f (g(x) ) = 8x2 - 8x - 48 - 2
f (g(x) ) = 8x2 - 8x - 50
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