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АJlИНКА
@АJlИНКА
July 2022
1
9
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ДАЮ 50 БАЛЛОВ
Решите уравнения
#8 и #9
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sedinalana
8
(x-2)(x²-4x-21)=0
x-2=0
x=2
x²-4x-21=0
x1+x2=4 u x1*x2=-21
x1=-3 u x2=7
ответ x={-3;2;7}
9
√x=a
a²-a-6=0
a1+a2=1 U a1*a2=-6
a1=-2⇒√x=-2 нет решения
а2=3⇒√х=3⇒х=9
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Answers & Comments
(x-2)(x²-4x-21)=0
x-2=0
x=2
x²-4x-21=0
x1+x2=4 u x1*x2=-21
x1=-3 u x2=7
ответ x={-3;2;7}
9
√x=a
a²-a-6=0
a1+a2=1 U a1*a2=-6
a1=-2⇒√x=-2 нет решения
а2=3⇒√х=3⇒х=9