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КПДшник
@КПДшник
August 2021
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afonckinanatali
1) 7x
^2 - 28 = 0
7x
^2 = 28 |7
x
^2 = +-корень из4
x1 = 2
x2 = -2
2) x
^2 - 13x + 22 = 0
Находим дискриминант:
D = b
^2 - 4ac
D = 13
^2 - 4*22 = 169 - 88 = 81
По т.о.т. Виетта:
x1+x2 = -b
x1x2 = c
x1+x2 = 13 | x1 = 11
x1x2 = 22 | x2 = 2
x1 = 11, x2 = 2.
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КПДшник
Спасибо большое. Очень помогли!
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Answers & Comments
7x^2 = 28 |7
x^2 = +-корень из4
x1 = 2
x2 = -2
2) x^2 - 13x + 22 = 0
Находим дискриминант:
D = b^2 - 4ac
D = 13^2 - 4*22 = 169 - 88 = 81
По т.о.т. Виетта:
x1+x2 = -b
x1x2 = c
x1+x2 = 13 | x1 = 11
x1x2 = 22 | x2 = 2
x1 = 11, x2 = 2.