7x^2-63 7x^2=63 x^2=9 x=3 А второе 5x^2+19x-4 D=b^2-4ac D=361+80=441 X1=-19+21/10=0.2 X2=-19-21/10=-4
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7x^2-63 7x^2=63 x^2=9 x=3 А второе 5x^2+19x-4 D=b^2-4ac D=361+80=441 X1=-19+21/10=0.2 X2=-19-21/10=-4