Soal dan Pembahasan Buku Matematika Sukino Kelas 11
Kelas XI
Bab 11 Turunan
A.
17. d/dx [ (x + 1 + 1/x) (x + 1 - 1/x)] = ...
a. 2/x3 (x4 + x3 + 1)
b. 1/x3 (x4 + x3 + 1)
c. 2/x3 (x4 + x3 - 1)
d. 1/x3 (x4 + x3 - 1)
e. 2/x3 (x4 - x3 + 1)
Jawaban : A
d/dx [ (x + 1 + 1/x) (x + 1 - 1/x)]
d/dx [ (x + 1 + 1/x) (x + 1 - 1/x)]
d/dx [ (x2 + x - 1 + x + 1 - 1/x + 1 + 1/x - 1/x2) ]
d/dx [ (x2 - 1/x2 + x + x + 1) ]
d/dx [ (x2 - 1/x2 + 2x + 1) ]
d/dx [ (x2 - x-2 + 2x + 1) ]
2x + 2x-3 + 2
dikalikan dengan x3 / x3
x3 (2x + 2x-3 + 2) / x3
= (2x4 + 2 + 2x3) / x3
= 2 (x4 + 1 + x3) / x3
= 2/x3 (x4 + x3 + 1)
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