Предмет: Алгебра, автор: Аноним

Найди корни уравнения 7,8(x−15)(x+39)=0 .
Помогите пожалуйста :P

Ответы

Автор ответа: Gviona
0
7,8(x-15)(x+39)=0
7,8(x^2+39x-15x-585)=0
x^2+24x-585=0
D=24^2-4*1*(-585)=2916
x1=(-24-54)/2=-39
x2=(-24+54)/2=15
Ответ:{-39; 15}
Автор ответа: Gviona
0
Можно проще: x-15=0 или x+39=0 ( обе части уравнения разделить на "7,8")
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