Объяснение:
4<x<5
4²<x²<5² , 16<x²<25
4<x<5 I *(-5) , -20>-5x>-25 ,-25<-5x<-20
_____________________
16-25<x²-5x<25-20
-9<x²-5x<5 I -1
-9-1<x²-5x-1<5-1
-8<x²-5x-1<4
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Answers & Comments
Объяснение:
4<x<5
4²<x²<5² , 16<x²<25
4<x<5 I *(-5) , -20>-5x>-25 ,-25<-5x<-20
_____________________
16-25<x²-5x<25-20
-9<x²-5x<5 I -1
-9-1<x²-5x-1<5-1
-8<x²-5x-1<4