( х в кавдрате - 5х) + 5-х=0
5-9 класс
|
х(х-5)-(х-5)=0
(х-5)х=0
система:х=0, система: х=0,
х-5=0; х=5.
так вроде)
(х в квадрате - 5х)+5-х=0 надо раскрыть скобку
х в квадрате - 5х +5-х=0
х в квадрате - 6х +5=0
а = 1 в =6 с=5
D(дискриминант) =в в квадрате - 4 * а*с
D=36 - 4 *1*5=36-20=16 16 > 0 (значит 2 корня)
х=(-6+корень из 16)/2=-2/2=-1
х=(-6-корень из 16)/2=-10/2=-5
Ответ:{-1;-5}
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