D = (-3)^2 - 4·5·(-2) = 9 + 40 = 49
x1 = (3 - √49)/2·5 = (3 - 7)/10 = -4/10 = -0.4
x2 = (3 + √49)/2·5 = (3 + 7)/10 = 10/10 = 1
в) х=0 у= 1
1 = 5*0^2-3*0-1
1≠ -1 нет
б) 1 = 5x^2-3x-1
5x^2-3x-1-1 = 0
5x^2 -3x-2 = 0
D = (-3)^2 - 4·5·(-2) = 9 + 40 = 49
x1 = (3 - √49)/2·5 = (3 - 7)/10 = -4/10 = -0.4
x2 = (3 + √49)/2·5 = (3 + 7)/10 = 10/10 = 1
в) х=0 у= 1
1 = 5*0^2-3*0-1
1≠ -1 нет