Предмет: Алгебра, автор: lobocevish321

x²-4x-5>0 помогите пожалуйста
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Ответы

Автор ответа: ringlet27
2

Ответ:

Д=16+20=36

√Д=6

х1=(4+6)/2=5

х2=(4-6) /2=-1

так как ветви параболы направлены вверх, то х принадлежит промежутку (-бесконечность;-1) и (5;+ бесконечность)

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