1)
- 8x² + 20x = 0 ,
-4х * (2х - 5) = 0,
-4х = 0, 2х - 5 = 0,
х1 = 0, 2х = 5,
х2 = 2,5
2)
3x² + 5 - 28 = 0,
3х² - 23 = 0,
3х² = 23,
х² = 23/3,
х² = 7 2/3,
х1 = √(7 2/3), х2 = - √(7 2/3)
1)
- 8x² + 20x = 0 ,
-4х * (2х - 5) = 0,
-4х = 0, 2х - 5 = 0,
х1 = 0, 2х = 5,
х2 = 2,5
2)
3x² + 5 - 28 = 0,
3х² - 23 = 0,
3х² = 23,
х² = 23/3,
х² = 7 2/3,
х1 = √(7 2/3), х2 = - √(7 2/3)