Ответ:
x^2-9=3x+1
x^2-9-3x-1=0
x^2-3x-10=0
D=9-4×(-10)=49. √49=7
x1,2=3±7/2=5; -2
x1=5. x2=-2
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Ответ:
x^2-9=3x+1
x^2-9-3x-1=0
x^2-3x-10=0
D=9-4×(-10)=49. √49=7
x1,2=3±7/2=5; -2
x1=5. x2=-2