y = ax² + bx + c funksiya — 9-sinf Algebra test savollari

1.y = 2x² - 8x + 5 funksiya parabolasining uchi koordinatalarini toping.

• A)(2; -3)
• B)(2; 3)
• C)(-2; -3)
• D)(4; 5)

2.y = -x² + 6x - 5 funksiyaning eng katta qiymatini toping.

• A)4
• B)5
• C)-4
• D)9

3.y = 3x² - 12x + 7 funksiya qaysi x da eng kichik qiymatga erishadi?

• A)x = 2
• B)x = -2
• C)x = 4
• D)x = 6

4.y = x² - 2x - 3 funksiya grafigi Ox o'qini qaysi nuqtalarda kesib o'tadi?

• A)x = -1 va x = 3
• B)x = 1 va x = -3
• C)x = -1 va x = -3
• D)x = 1 va x = 3

5.y = ax² + bx + c parabolasining uchi A(3; -4) nuqtada, a = 1. c ni toping (b ni ham hisoblab).

• A)c = 5
• B)c = -4
• C)c = 3
• D)c = 9

6.y = -2x² + 4x + 1 funksiyaning simmetriya o'qi tenglamasini yozing.

• A)x = 1
• B)x = -1
• C)x = 2
• D)x = -2

7.y = x² + 4x funksiyaning eng kichik qiymatini toping.

• A)-4
• B)0
• C)4
• D)-2

8.y = 2x² - 8x + 3 funksiyada uchining abssissasi (x₀ $=-\frac{b}{2a}$) ni toping.

• A)2
• B)-2
• C)4
• D)8

9.y = -x² + 2x + 8 funksiya grafigi Oy o'qini qaysi nuqtada kesadi?

• A)(0; 8)
• B)(8; 0)
• C)(0; -8)
• D)(2; 8)

10.y = x² - 6x + 9 funksiya grafigi Ox o'qi bilan nechta umumiy nuqtaga ega?

• A)1 ta
• B)2 ta
• C)0 ta
• D)cheksiz ko'p