Question

x( х + 5 ) = 104
х-5 / x = ( х-1 ) +4/х
( х-2)/x = 1/2

Answer 1

х(х+5)=104
х² +5х -104=0
D=5²+4*104=441   (±21²)
x1=(-5-21)/2= - 13
x2=( -5+21)/2=8

(x-5)/x=(x-1)+ 4/x              x≠0
x-5=x(x-1)+4
x-5=x²-x+4
x² -2x+9=0
D/4=1²-9= - 8 -решений нет

(х-2)/х=1/2            х≠0
2*(х-2)=х
2х-4=х
2х-х=4
х=4