Предмет: Алгебра, автор: oliviachay237

Помогите пожалуйста решить уравнение х2-7х+4=0

Ответы

Автор ответа: tomyy228

Ответ:

x²-7x-4=0

Найдем дискриминант

Д=49-16=65

x₁=(7+√65)/2

x₂=(7-√65)/2

x₁+x₂=(7+√65)/2+(7-√65)/2=(7+√65+7-√65)/2=14/2=7

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