Question

ДОПОМОЖІТЬ СРОЧНО!100 балів

Answer 1

1) 25х^2 - 10х + 1 = 0

(5х - 1)^2 = 0

5х - 1 = 0

5х = 1

х = 1/5

2) 4х^2 - 5 = (3х-2)(4х-5)

4х^2 - 5 = 12х^2 - 15х - 8х + 10

-8х^2 - 5 + 15х + 8х - 10 = 0

- 8х^2 + 23х - 15 = 0

D = 529 - 480 = 49

x1 = 23+7 / 16 = 15/8

x2 = 23-7 / 16 = 1

3)x^2 + 5x + 14 = 0

D = 25 - 4*1*14 < 0

Корней нет