Mynegiadau cwadratig - Canolradd ac uwch test questions - TGAU Mathemateg Revision

1

Ehanga (x – 2)(x + 4)

x² + 2x – 8

x² + 6x – 8

x² + 6x + 8

2

Ehanga (x – 4)(x – 6)

x² – 10x – 24

x² + 10x – 24

x² – 10x + 24

3

Canfydda ffactorau x² – 9x + 20

(x – 4)(x – 5)

(x – 8)(x – 1)

(x + 6.5)(x – 14.5)

4

Canfydda ffactorau x² + 4x – 21

(x – 7)(x + 3)

(x + 7)(x – 3)

(x – 7)(x – 3)

5

Canfydda ffactorau 9x² – 25

(9x – 5)(9x + 5)

(3x – 5)(3x + 5)

(4.5x – 5)(4.5x + 5)

6

Canfydda ffactorau 3x² – 14x – 5

(3x – 5)(x + 1)

(3x + 5)(x – 1)

(3x + 1)(x – 5)

7

Mae 2 betryal gydag arwynebedd x² + 2x – 3 yn cael eu rhoi at ei gilydd. Pa rai o’r parau canlynol a allai gynrychioli hyd ochrau’r siâp newydd?

(x – 1), (x + 3)

(2x – 2), (x + 3)

(x – 1), (2x + 3)

8

Datrysa x² + 17x + 16 = 0 trwy ffactorio.

x = 1 a x = 16

x = –1 a x = –16

x = 1 a x = –16

9

Datrysa x² – 4x + 2 = 0 gan ddefnyddio’r fformiwla gwadratig.

x = –0.586 a x = –3.313

x = –0.586 a x = 3.414

x = 0.586 a x = 3.414

10

Dyma graff y = x² – 5x – 20:

Defnyddia’r graff i ddatrys x² – 5x – 20 = 0.

(x = –2.5) , (x = 7.5)

(x = –2.1) , (x = 6.4)

(x = –2.2) , (x = 6.8)