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pfqwtd1
@pfqwtd1
July 2022
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Решите неравенство, срочно!!
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zahargm808
-16/
x²+4x-1>0
D=16+4=20
x=(-4+-√20)/2
x=-2-√5; x= -2+√5
x∈(-2-
√5
, -2+√5)
1 votes
Thanks 1
sedinalana
-16<0⇒(x+2)²-5<0
(x+2-√5)(x+2+√5)<0
x=√5-2 U x=-√5-2
x∈(-2-√5;-2+√5)
1 votes
Thanks 1
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Answers & Comments
x²+4x-1>0
D=16+4=20
x=(-4+-√20)/2
x=-2-√5; x= -2+√5
x∈(-2-√5, -2+√5)
(x+2-√5)(x+2+√5)<0
x=√5-2 U x=-√5-2
x∈(-2-√5;-2+√5)