Предмет: Алгебра, автор: daryashepina

докажите что при любом значении х верно неравенство 4х^2-20х+26>0

Ответы

Автор ответа: Лотарингская

дискрименант меньше нуля, значит корней нет, а так как перед х^4 стоит коэффициент положительный, значит парабола направлена ветвями в верх, значит лежит в выше прямой y=0 , значит 4х^2-20х+26>0

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