Предмет: Алгебра, автор: kegmpoerm

в) 2(x+4)-x(x-5)=7(x-8)
г) (3/x-5)+(8/x)=2
д) $sqrt{x}$ +6=x

Ответы

Автор ответа: 99tasha

в) 2х+8-х²+5х=7х-56
-х²+2х-7х+5х+8+56=0
-х²+64=0
х²=64
х=√64
х1=8
х2=-8

г) 3/(х-5)+8/х=2
3х+8х-40-2х²+10х=0
-2х²+21х-40=0
Д=441-320=121
х1=(-21+11)/-4=10/4=5/2=2,5
х2=(-21-11)/-4=32/4=8

д) (√х+6)²=х²
х+6=х²
х²-х-6=0
Д=1+24=25
х1=(1+5)/2=3
х2=(1-5)/2=-2

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