Question

даны уравнения 7x^2 -20x+13=0
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Answer 1

Ответ:

1) D = 400 - 364 = 36

x1 = 20 + 6|14 =1,8

x2 = 20-6|14 = 1

2) D = 25 + 96 = 121

x1 = -5 + 11|2 = 3

x2 = -5 -11l2 = -8

3) D = 169 -120 = 49

x1 = -13 + 7|30 = -0,2

x2 = -13 - 7|30 = -0,6