Kelas X
Bab 2 Fungsi, Persamaan, dan Pertidaksamaan Logaritma
Matematika Sukino Kelas X
Kunci Jawaban Matematika Sukino
Soal dan Pembahasan Matematika Sukino Kelas X
Bagian A
19. 8log (β(8 + 2β12)) + 8log(β(8 - 4β3)) sama dengan ...
a. 6/3
b. 5/3
c. 4/3
d. 3/3
e. 2/3
Jawaban : E
8log (β(8 + 2β12)) + 8log(β(8 - 4β3))
= 1/2 . 8log (8 + 2β12) + 8log(8 - 4β3)
= 1/2 . 8log (8 + 2β12)) . (8 - 4β3))
= 1/2 .8log (64 - 32β3 + 16β12 - 8β36)
= 1/2 .8log (64 - 32β3 + 16β4β3 - 8 . 6)
= 1/2 .8log (64 - 32β3 + 32β3 - 48)
= 1/2 .8log (16)
= 1/2 .2^3log 24
= 1/2 . 4/3
= 4/6 = 2/3
>> soal no 20
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