Предмет: Алгебра, автор: 12gf

Найдите точки экстремума и определите их характер у=х³+х²-х+3
с решением!

Ответы

Автор ответа: lidusya13
3
У'=3х^+2х-1;
3х^2+2х-1=0;
Д=16;х=1/3;х=-1;
________-1________1/3_______
+. - +
С каждого промежутка берем число и подставляем в производную,чтобы определить знак.
(-~;1)-возрастает;(-1;1/3)-убывает;(1/3;+~)-возрастает;
-1-точка максимума;
1/3- минимума
,

12gf: почему в Д х2= 1 с минусом? (2+4/6=1)
lidusya13: (-2-4)/6=-1
lidusya13: (-2+4)/6=1/3
12gf: в производной тогда откуда 2-я переменная равна 2х? если х³+х²-х
12gf: лул, это я перепутал знак)))
12gf: х^3-x^2-х+3
lidusya13: так эту найти?
12gf: нет) спасибо, просто после производной забыл как решать
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