Kelas XI
SMA Kelas XI
Buku Sukino Kelompok Wajib
Kunci Jawaban Matematika Buku Sukino Kelas XI Kelompok Wajib
RUKO 1
19. Jika K(x) = nx3 + 9x + 2 dan zK' (1) = 0 maka K'(-1) = ...
a. 18
b. 9
c. 0
d. - 9
e. - 18
Jawaban : C
K(x) = nx3 + 9x + 2
K'(x) = 3nx2 + 9
K' (1) = 0
K' (1) = 3nx2 + 9
0 = 3n(1)2 + 9
0 = 3n + 9
3n = - 9
n = - 3
K'(-1) = 3 . - 3 (-1)2 + 9
K'(-1) = -9 + 9
K'(-1) = 0
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