Question

решите систему уравнений х+у=-5,ху=-36

Answer 1

$left { {{x+y=-5} atop {xy=-36}} right. \ left { {{x=-5-y} atop {y(-5-y)=-36}} right. \ y=-36 ; -5-y=-36 \ -y=-36+5 \ -y=-31 \ y=31$$\ x_{1} =-5+36 \ x_{1} =31 \ x_{2} ==-5-31 \ x_{2} =-36$