Question

-(у-1)^2+у(у-7),при у=-2/3

Answer 1

-(у-1)^2+у(у-7)= -(у^2-2у+1)+у^2-7у= -у^2+2у-1+у^2-7у=-5у-1

При х=-2/3; -5*(-2/3)-1=10/3-1=7/3