Try Out 3 Matematika Ipa 2019 No 1

Try Out Matematika IPA 2019
Soal dan Pembahasan Try Out Matematika IPA 2019
Jawaban Try Out Matematika IPA 2019
Try Out Ujian Matematika Sekolah Menengan Atas IPA

1. Jika diketahui fungsi f(x) = 2x - 6, f : R → R dan (g o f) (x) = 6x - 14 maka g^-1(10)= ...

A. -26
B. -2
C. 2
D. 26
E. 34



Jawaban : C

f(x) = 2x - 6
y = 2x - 6
2x = y + 6
x = 1/2 y + 3

g ( f(x) ) = 6x - 14

g(x) = 6 (1/2 y + 3) - 14
g(x) = 3y + 18 - 14
g(x) = 3y + 4

g(x) = 3x + 4
y = 3x + 4
3x = y - 4
x = 1/3y - 4/3

g^-1(x) = 1/3 x - 4/3
g^-1(10) = 10/3 - 4/3 = 2

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