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Mavzu:
Chala
kvadrat
tenglamala
r
REJA:
1, Chala kvadrat tenglama
haqida tushuncha.
2. Chala kvadrat tenglama
ko’rinishlari.
3.Mavzuga doir masalalar
yechish.
Agar ax2+bx+c=0 kvadrat
tenglamada b yoki c
koeffitsientlardan aqalli bittasi
nolga teng bo’lsa, u holda bu
tenglama
chala kvadrat tenglama
deyiladi.
Demak, chala kvadrat
tenglama quyidagilardan
biri ko’rinishida bo’ladi:
ax2=0,
ax2+c=0, c≠0,
ax2+bx=0, b≠0.
quyidagi tenglamalarda
a koeffitsient nolga teng
emasligini eslatib
o’tamiz. a≠ 𝟎
1. ax2=0 ikkala qismini ham a ga
bo’lamiz. X2=0 bundan x=0 ni hosil
qilamiz.
Tenglamani yeching.
5x2=0.
Bu tenglamaning ikkala qismini 5 ga
bo’lib,
x2 =0
ni hosil qilamiz, bundan x=0.
2. ax2+c=0 c ni tenglikning o’ng
qismiga o’tkazamiz. ax2=-c ikkala
qismini a ga bo’lamiz x2=−
𝑐
𝑎
.
x1,2=± −
𝒄
𝒂
a) −
𝑐
𝑎
> 0 bo’lsa tenglama ikkita
ildizga ega.
b) −
𝑐
𝑎
=0 bo’lsa tenglama yagona
ildizga ega.
c) −
𝑐
𝑎
< 0 bo’lsa tenglama ildizga
ega emas.
2-masala:
Tenglamani yeching:
3 x2 - 27=0
Tenglamaning ikkala qismini 3 ga
bo’lamiz:
x2 – 9=0
Bu tenglamani quyidagicha yozish
mumkin.
x2=9
bunda X½=±𝟑
3-Tenglama:
2x2+7=0
Tenglamani bunday yozish mumkin:
x2=-
𝟕
𝟐
Bu tenglama haqiqiy ildizlarga ega
emas,
chunki x ning istalgan qiymatida
x2≥ 0
bo’ladi.
3. ax2+bx=0 umumiy ko’paytuvchi x
ni chiqarib olamiz. x(ax+b)=0
bundan x1=0 va ax+b=0 ax=-b
x2=−
𝑏
𝑎
ni hosil qilamiz.
Masalan: -3X²+5x=0
Tenlamaning chap qismini
ko’paytuvchilarga ajratib,
x(-3x+5)=0
ekanini hosil qilamiz,bunda:
X1=0, x₂=
𝟓
𝟑
.
Javob: X1=0, x₂=
𝟓
𝟑
.
Uyga vazifa:
Mavzuni to’liq o’qish,
306- mashqni
yechish

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20

  • 2. REJA: 1, Chala kvadrat tenglama haqida tushuncha. 2. Chala kvadrat tenglama ko’rinishlari. 3.Mavzuga doir masalalar yechish.
  • 3. Agar ax2+bx+c=0 kvadrat tenglamada b yoki c koeffitsientlardan aqalli bittasi nolga teng bo’lsa, u holda bu tenglama chala kvadrat tenglama deyiladi.
  • 4. Demak, chala kvadrat tenglama quyidagilardan biri ko’rinishida bo’ladi: ax2=0, ax2+c=0, c≠0, ax2+bx=0, b≠0. quyidagi tenglamalarda a koeffitsient nolga teng emasligini eslatib o’tamiz. a≠ 𝟎
  • 5. 1. ax2=0 ikkala qismini ham a ga bo’lamiz. X2=0 bundan x=0 ni hosil qilamiz. Tenglamani yeching. 5x2=0. Bu tenglamaning ikkala qismini 5 ga bo’lib, x2 =0 ni hosil qilamiz, bundan x=0.
  • 6. 2. ax2+c=0 c ni tenglikning o’ng qismiga o’tkazamiz. ax2=-c ikkala qismini a ga bo’lamiz x2=− 𝑐 𝑎 . x1,2=± − 𝒄 𝒂 a) − 𝑐 𝑎 > 0 bo’lsa tenglama ikkita ildizga ega. b) − 𝑐 𝑎 =0 bo’lsa tenglama yagona ildizga ega. c) − 𝑐 𝑎 < 0 bo’lsa tenglama ildizga ega emas.
  • 7. 2-masala: Tenglamani yeching: 3 x2 - 27=0 Tenglamaning ikkala qismini 3 ga bo’lamiz: x2 – 9=0 Bu tenglamani quyidagicha yozish mumkin. x2=9 bunda X½=±𝟑
  • 8. 3-Tenglama: 2x2+7=0 Tenglamani bunday yozish mumkin: x2=- 𝟕 𝟐 Bu tenglama haqiqiy ildizlarga ega emas, chunki x ning istalgan qiymatida x2≥ 0 bo’ladi.
  • 9. 3. ax2+bx=0 umumiy ko’paytuvchi x ni chiqarib olamiz. x(ax+b)=0 bundan x1=0 va ax+b=0 ax=-b x2=− 𝑏 𝑎 ni hosil qilamiz. Masalan: -3X²+5x=0 Tenlamaning chap qismini ko’paytuvchilarga ajratib, x(-3x+5)=0 ekanini hosil qilamiz,bunda: X1=0, x₂= 𝟓 𝟑 . Javob: X1=0, x₂= 𝟓 𝟑 .
  • 10. Uyga vazifa: Mavzuni to’liq o’qish, 306- mashqni yechish