1. 4 1 3

4x² + x + 3 = 0 ;

-2 -3 1

-2x² - 3x + 1 = 0 ;

1 0 -24

x² - 24 = 0 ;

3 -5 0

3x² - 5x = 0 ;

5 0 -8

5x² - 8 = 0

7 0 0

7x² = 0

2. a) x² - 36 = 0

x² = 36

x = +-6 ;

б) 2x² - 4 = 0

2x² = 4

x² = 2

x = +-√2 ;

в) x² + 49 = 0

x² = -49

x∉R ; (нет решения)

а)x² - 3x = 0

x(x-3) = 0

x1 = 0

x2 = 3 ;

б) -5x² + 20x = 0

-x(5x - 20) = 0

x1 = 0

x2 = 4 ;

в) x² + 3,5x = 0

x(x + 3,5) = 0

x1 = 0

x2 = -3,5 ;

а) 7 - 2x² = 7 + 0,5x²

-2x² - 0,5x² = 7 - 7

-2,5x² = 0

x = 0 ;

б) 2x² - 3x = 2x

2x² - 3x - 2x = 0

2x² - 5x = 0

x(2x - 5) = 0

x1 = 0

x2 = 2,5 ;

в) 2x(x-3) = x²

2x² - 6x = x²

2x² - x² - 6x = 0

x² - 6x = 0

x(x - 6) = 0

x1 = 0

x2 = 6 ;