Предмет: Алгебра, автор: medses

х⁴+3х² - 4=0 помогите, пожалуйста! Это же с дискриминантом?

Ответы

Автор ответа: Alabaya

Обозначим x^2 = y
Тогда:
y^2+3y-4=0
D=3^2-(-4)*4=9+16=25
y1,2=(-3 +/- 5)/2
y1=1; y2=-4
x1=1; x2=-1;x3,x4 - не существует, Т.к. Нельзя извлечь корень из отрицательного числа

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