Ответы и объяснения

Лучший Ответ!
2013-05-08T02:22:03+00:00

1) x² - x = 0, x * ( x - 1) = 0, x = 0, x = 1,

2) x² + 5x + 6 = 0, x1 = -2, x2 = -3,

3) 5x² + 8x - 4 =0, D = 12², x1 = -2, x2 = 0.4

4) x² - 6x + 7 = 0, D = 36 - 28 = 4 * 2, x = 3 ± √2

5) 7x = 4x², x = 7/4 = 1.75

6) x² - 6x + 5 = 0, x1 = 5, x2 = 1,

7) 5x² - 3 = 0, x = √(3/5)

8) 2x² - x + 3= 0, D<0 - нет корней