1) x1+x2=8 x1*x2=-9 => x1=9 x2=-1
2) корней нет
3)x1+x2=5 x1*x2=6 x1=3 x2=2
1)х= -1 х = 9 ( т.к. -1*9 = -9 =с и -1+9 = 8 = -b)
3) х= 2 х = 3 ( т.к.2*3 = 6 =с и 2+3 = 5 = -b)
1) x1+x2=8 x1*x2=-9 => x1=9 x2=-1
2) корней нет
3)x1+x2=5 x1*x2=6 x1=3 x2=2
1)х= -1 х = 9 ( т.к. -1*9 = -9 =с и -1+9 = 8 = -b)
2) корней нет
3) х= 2 х = 3 ( т.к.2*3 = 6 =с и 2+3 = 5 = -b)