y=3x+1
x^2-2x(3x+1)+(3x+1)^2=9
x^2-6x^2-2x+9x^2+6x+1-9=0
4x^2+4x-8=0
x^2+x-2=0
D=1+8=9
x1= (-1-3)/2= -2
x2= (-1+3)/2= 1
y1= -5
y2= 4
(-2; -5), (1; 4)
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y=3x+1
x^2-2x(3x+1)+(3x+1)^2=9
y=3x+1
x^2-6x^2-2x+9x^2+6x+1-9=0
y=3x+1
4x^2+4x-8=0
x^2+x-2=0
D=1+8=9
x1= (-1-3)/2= -2
x2= (-1+3)/2= 1
y1= -5
y2= 4
(-2; -5), (1; 4)
х^2-2х•(1+3х)+(1+3х)^2=9
х^2-2х-6х^2+1+6х+9х^2=9
4х^2+4х-8=0
Д= 16-4•(-8)•4=144=12^2
х1=-4+12/8=1
х2=-4-12/8=-2