SMA
Tahun 2018
Matematika IPA
Kunci Jawaban USBN Matematika IPA Tahun 2018
23. lim x →4
√4x - √(5x-4)
----------------- = ...
x2 - 16
a. - 1/64
b. - 1/32
c. 1/64
d. 1/32
e. 1/16
Jawaban : A
lim x →4
√4x - √(5x-4)
----------------- =
x2 - 16
lim x →4
√4x - √(5x-4) √4x + √(5x-4)
----------------- . ----------------- =
x2 - 16 √4x + √(5x-4)
lim x →4
4x - (5x - 4)
------------------------------------ =
(x - 4) (x + 4) (√4x + √(5x-4))
lim x →4
- x + 4
------------------------------------ =
(x - 4) (x + 4) (√4x + √(5x-4))
lim x →4
-
------------------------------------ =
lim x →4
- 1
----------------------------- =
(x + 4) (√4x + √(5x-4))
masukkan x = 4
- 1
----------------------------- =
(4 + 4) (√16 + √(20-4))
- 1
------------- = - 1/64
8 . (4 + 4)
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