[tex]\displaystyle\bf\\y^{2} -5y-24=0\\\\(y^{2} -5y+6,25)-30,25=0\\\\(y-2,5)^{2} -5,5^{2} =0\\\\(y-2,5-5,5)(y-2,5+5,5)=0\\\\(y-8)(y+3)=0\\\\\\\left[\begin{array}{ccc}y-8=0\\y+3=0\end{array}\right\\\\\\\left[\begin{array}{ccc}y_{1} =8\\y_{2} =-3\end{array}\right\\\\\\Otvet \ : \ 8 \ ; \ -3[/tex]