у=9-х2
9-х2=0
-х2+9=0
х2-9=0
Д=0-4*1*(-9)=36>0
х1=0-√36:2=-6:2=-3;
х2=6:2=3
(0;-3) и (0;3)
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у=9-х2
9-х2=0
-х2+9=0
х2-9=0
Д=0-4*1*(-9)=36>0
х1=0-√36:2=-6:2=-3;
х2=6:2=3
(0;-3) и (0;3)