Ответ:
у=5х+30-х²-6х
у=-х²-х+30
D=121
х1= -6
х2=6
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y=5x+30-x^2-6x-25
y=-x^2-x+5
Ответ:
у=5х+30-х²-6х
у=-х²-х+30
D=121
х1= -6
х2=6