Soal dan Pembahasan
Soal Try Out Matematika IPA
Soal Ujian Nasional SMA
UN Matematika IPA
27. d/dxx2 - 7
-------- = ...
x √x
a. (x2 + 21) / 2x3√x
b. (x2 + 21) / x2√x
c. (x2 - 21) / 2x2√x
d. x2 / (2x3√x + 21)
e. (x2 + 21) / 2x√x
Jawaban :
u = x2 - 7
u ' = 2x
v = x √x = x3/2
v' = 3/2 x1/2
menggunakan turunan u/v = u'v - v'u / v2
2x . x3/2 - 3/2 x1/2 . (x2 - 7)
= ----------------------------------
(x3/2)2
2x5/2 - 3/2 x5/2+ 21/2 x1/2
= ---------------------------------
x3
1/2 x5/2+ 21/2 x1/2
= -----------------------
x3
x1/2 (x2 + 21)
= ------------------
2x3
(x2 + 21)
= ------------------
2x3x-1/2
(x2 + 21)
= ------------------
2x5/2
= (x2 + 21) / 2x2√x
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