x²-6x+9=16
x²-6x-7=0
D=36+28=64
x1,2= 6±8/2
x1= -1
x2= 7
х²-6х+9-16=0
х²-6х-7=0
D=6²-4×1×7=36+28=64
x1=7
x2=-1
x²-6x+9=16
x²-6x-7=0
D=36+28=64
x1,2= 6±8/2
x1= -1
x2= 7
х²-6х+9-16=0
х²-6х-7=0
D=6²-4×1×7=36+28=64
x1=7
x2=-1