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@gjjgljfgj54
October 2021
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Решите неравенство х^2 - 4 х - 21 > 0
Х^ + 10х > 0
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exaa3321
Аооккммппвттаацрцусшоутиуммммма
2 votes
Thanks 1
sergeyxpp
1)
х^2 - 4 х - 21 > 0
D=16-4*(-21)=100
x1=(4+
√100)/2=7
x2=(4-
√100)/2=-3
Ответ: x
∈(-∞;-3);(7;+
∞).
2)Х^2 + 10х > 0
x(x+10)>0
x=0 ; x=10
Ответ: x∈(-∞;-10);(0;+∞).
0 votes
Thanks 0
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Answers & Comments
D=16-4*(-21)=100
x1=(4+√100)/2=7
x2=(4-√100)/2=-3
Ответ: x∈(-∞;-3);(7;+∞).
2)Х^2 + 10х > 0
x(x+10)>0
x=0 ; x=10
Ответ: x∈(-∞;-10);(0;+∞).