Question

помогите плиз алгебра и геометрия пжпж

Answer 1

Ответ:

1. 5x2 + 10x = 0

25x + 10x = 0

35x = 0

x = 0 : 35

x = 0

2. 9x2 - 4 = 0

9x2 = 4

x2 = 4/9

x = 2/3

x = -2/3

3. x2 - 7x + 6 = 0

x2 - x - 6x + 6 = 0

x × (x - 1) - 6 (x - 1) = 0

(x - 1) × (x - 6) = 0

x - 1 = 0

x - 6 = 0

x = 1

x = 6

4. 2x2 + 3x + 4 = 0

4x + 3x + 4 = 0

7x = - 4

x = - 4/7