1.                (Og`zaki.) quyida ko`rsatilgan funksiyalardan qaysilari kvadrat funksiya bo`ladi:

1) y = 2x² + x + 3;                   2) y = 3x² – 1;                 3) y = 5x + 1;

4) y = x³ + 7x – 1;                   5) y = 4x²;                       6) y = –3x² + 2x

 

2.                x ning shunday haqiqiy qiymatlarini topingki, y = x² – x – 3 kvadrat funksiya:  1) –1 ga;  2) –3 ga;  3) ;  4) –5 ga teng qiymat qabul qilsin.

 

3.                x ning qanday haqiqiy qiymatlarida y = – 4x² + 3x – 1 kvadrat funksiya:  1) –2;  2) –8;  3) –0,5;  4) –1 ga teng qiymatlar qabul qiladi?

 

4.                –2; 0; 1;  sonlaridan qaysilari quyidagi kvadrat funksiyaning nollari bo`ladi:

1) y = x² + 2x;                                             2) y = x² + x;

3) y = x² – 3x;                                             4) y = 5x² – 4x – 1?

 

5.                Kvadrat funksiyaning nollarini toping:

1) y = x² – x;                                               2) y = x² + 3x;

2) y = 12x² – 17x + 6;                                 4) y = –6x² + 7x – 2;

5) y = 3x² – 5x + 8;                                     6) y = 2x² – 7x + 9;

7) y = 8x² + 8x + 2;                                     8)

 

9) y = 2x² + x – 1;                                      10) y = 3x² + 5x – 2.

 

6.                Agar y = x² + px + q kvadrat funksiyaning x₁ va x₂ nollari ma’lum bo`lsa, p va q koeffitsiyentlarni toping:

1) x₁ = 2,    x₂ = 3;                                      2) x₁ = -4, x₂ = -1;

3) x₁ = -1,   x₂ = 3;                                      4) x₁ = 5, x₂ = -3;

 

7.                x ning  y  = x² +2x – 3 va  y= 2x +1; funksiyalar teng qiymatlar qabul qiladigan qiymatlarini toping.

                  

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