- 4x = - 10
4x = 10
x = 2,5
- x^2 = - 100
x^2 = 100
x = 10
x = - 10
- 2x^2 = 0
x^2 = 0
x =0
- x^2 = - 13
x^2 = 13
x = √13
x = - √13
x^2 - 12x + 33 = 0
D = b^2 - 4ac = 144 - 132 = 12
x1,2 = ( 12+/-√12) / 2
x^2 - x - 12 =0
D = b^2 - 4ac = 1 + 48 = 49 = 7^2
x1 = ( 1 + 7) / 2 = 4
x2 = ( 1 - 7) / 2 = - 3
x^2 - 12x + 36 = 0
D = b^2 - 4ac = 144 - 144 = 0 - имеет один корень
x = - b/2a
x = 12/2 = 6
x = 6
x^2 + 4x + 20 = 0
D = b^2 - 4ac = 16 - 80 = - 64 - дискиминант отрицательный,значит,корней нет.