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MATEMATIKA DASAR ASWAR AMIRUDDIN, ST.,
MT.
PERTEMUAN 7
 Kekontinuan fungsi
 Kontinu kiri dan kontinu kanan
FUNGSI KONTINU DI SUATU
TITIK
Misalkan f terdefinisi
disekitar c, termasuk di c.
Fungsi f dikatakan kontinu
di c apabila
lim
x → c
𝑓(𝑥) = 𝑓(𝑐)
yakni: untuk setiap ε > 0
terdapat δ > 0 sehingga:
jika |x – c|< δ, maka|f(x) –
f(c)|< ε.
Fungsi f dikatakan kontinu
pada (a,b) apabila f
kontinu di setiap titik c є
(a,b).
FUNGSI KONTINU DI SUATU
TITIK
Definisi Fungsi f dikatakan kontinu di c apabila
lim
x → c
𝑓(𝑥) = 𝑓 𝑐
Jika diperuhi ketiga syarat berikut :
1. lim
x → c
f(x) ada
2. Nilai f c ada
3. lim
x → c
f(x) = f c
Jika paling kurang salah satu syarat diatas tidak dipenuhi maka f
dikatakan tidak kontinu di x=a
Nilai f(a) tidak ada
f tidak kontinu di 𝑥 =
𝑎
Karena limit kiri(L1)
tidak
sama dengan limit
kanan (L2), maka f(x)
tidak mempunyai
limit di x=a
 𝑓 𝑎 ada

lim
x → a
f(x) ada

lim
x → a
f(x) ≠ 𝑓(𝑎)
 𝑓 𝑎 ada

lim
x → a
f(x) ada

lim
x → a
f(x) = 𝑓(𝑎)
FUNGSI KONTINU DI SUATU
TITIK
FUNGSI KONTINU DI SUATU
TITIK
Contoh soal :
𝑓 𝑥 =
𝑥2−4
𝑥−2
4
Apakah f kontinu di x = 2 ?
Jawab :
1.
lim
x → 2
𝑥2−4
𝑥−2
=
lim
x → 2
(𝑥−2)(𝑥+2)
(𝑥−2)
=
lim
x → 2
𝑥 + 2 = 4
2. 𝑓 2 = 4
3.
lim
x → 2
𝑥2−4
𝑥−2
= 𝑓(2) , maka 𝑓 kontinu di x = 2.
FUNGSI KONTINU DI SUATU
TITIK
, 𝑥 ≠ 2
, 𝑥 = 2
Teorema 2.7.1
1. Fungsi polinom (fungsi suku banyak) kontinu pada R.
2. Jika fungsi-fungsi f dan g keduanya kontinu di c dan k
sembarang konstanta maka fungsi f + g, f – g, kf , f/g
(asal lim g(x) ≠ 0) juga kontinu di c.
3. Jika g fungsi yang kontinu di c dan f fungsi kontinu di
g(c) maka f o g kontinu di c.
FUNGSI KONTINU
FUNGSI KONTINU
FUNGSI KONTINU
Pertemuan 7

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Pertemuan 7

  • 1. MATEMATIKA DASAR ASWAR AMIRUDDIN, ST., MT.
  • 2. PERTEMUAN 7  Kekontinuan fungsi  Kontinu kiri dan kontinu kanan
  • 3. FUNGSI KONTINU DI SUATU TITIK Misalkan f terdefinisi disekitar c, termasuk di c. Fungsi f dikatakan kontinu di c apabila lim x → c 𝑓(𝑥) = 𝑓(𝑐) yakni: untuk setiap ε > 0 terdapat δ > 0 sehingga: jika |x – c|< δ, maka|f(x) – f(c)|< ε. Fungsi f dikatakan kontinu pada (a,b) apabila f kontinu di setiap titik c є (a,b).
  • 4. FUNGSI KONTINU DI SUATU TITIK Definisi Fungsi f dikatakan kontinu di c apabila lim x → c 𝑓(𝑥) = 𝑓 𝑐 Jika diperuhi ketiga syarat berikut : 1. lim x → c f(x) ada 2. Nilai f c ada 3. lim x → c f(x) = f c Jika paling kurang salah satu syarat diatas tidak dipenuhi maka f dikatakan tidak kontinu di x=a
  • 5. Nilai f(a) tidak ada f tidak kontinu di 𝑥 = 𝑎 Karena limit kiri(L1) tidak sama dengan limit kanan (L2), maka f(x) tidak mempunyai limit di x=a  𝑓 𝑎 ada  lim x → a f(x) ada  lim x → a f(x) ≠ 𝑓(𝑎)  𝑓 𝑎 ada  lim x → a f(x) ada  lim x → a f(x) = 𝑓(𝑎)
  • 6. FUNGSI KONTINU DI SUATU TITIK
  • 7. FUNGSI KONTINU DI SUATU TITIK
  • 8. Contoh soal : 𝑓 𝑥 = 𝑥2−4 𝑥−2 4 Apakah f kontinu di x = 2 ? Jawab : 1. lim x → 2 𝑥2−4 𝑥−2 = lim x → 2 (𝑥−2)(𝑥+2) (𝑥−2) = lim x → 2 𝑥 + 2 = 4 2. 𝑓 2 = 4 3. lim x → 2 𝑥2−4 𝑥−2 = 𝑓(2) , maka 𝑓 kontinu di x = 2. FUNGSI KONTINU DI SUATU TITIK , 𝑥 ≠ 2 , 𝑥 = 2
  • 9.
  • 10. Teorema 2.7.1 1. Fungsi polinom (fungsi suku banyak) kontinu pada R. 2. Jika fungsi-fungsi f dan g keduanya kontinu di c dan k sembarang konstanta maka fungsi f + g, f – g, kf , f/g (asal lim g(x) ≠ 0) juga kontinu di c. 3. Jika g fungsi yang kontinu di c dan f fungsi kontinu di g(c) maka f o g kontinu di c. FUNGSI KONTINU