Matematika Sukino Peminatan Kelas XII
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2. Nilai lim xβ5 (β(x + 4) - β(14 - x)) / (x2 - 2x - 15) adalah ...
a. 1/24
b. 1/6
c. 5/24
d. 1/4
e. 1/3
Jawaban : A
lim xβ5
β(x + 4) - β(14 - x)
------------------------- =
x2 - 2x - 15
lim xβ5
β(x + 4) - β(14 - x) β(x + 4) + β(14 - x)
------------------------- . ---------------------------- =
(x - 5) (x + 3) β(x + 4) + β(14 - x)
lim xβ5
(x + 4) - (14 - x)
------------------------------------------- =
(x - 5) (x + 3) β(x + 4) + β(14 - x)
lim xβ5
x + 4 - 14 + x
------------------------------------------- =
(x - 5) (x + 3) β(x + 4) + β(14 - x)
lim xβ5
2x - 10
------------------------------------------- =
(x - 5) (x + 3) β(x + 4) + β(14 - x)
lim xβ5
2(x - 5)
------------------------------------------- =
(x - 5) (x + 3) β(x + 4) + β(14 - x)
lim xβ5
2
------------------------------------------- =
lim xβ5
2
---------------------------------- =
(x + 3) β(x + 4) + β(14 - x)
2
---------------------------------- =
(5 + 3) β(5 + 4) + β(14 - 5)
2
-------------- =
8(β9 + β9)
2
------ = 2/48 = 1/24
8(6)
>>soal no 3
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