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<span>(Х-2)(х+3)-9=х-6
x</span>²+3x-2x-6-9=x-6
x²+x-15-x+6=0
x²-9=0
(x-3)(x+3)=0
x1=3
x2=-3
А(х-у)+3(х-у)/(а-3)(а+3)=(х-у)(а+3)/(а+3)(а-3)=х-у/а-3 5,8-3,4/3,1-3=2,4/0,1
D = √( (x2 - x1)^2 + (y2 - y1)^2) =
= √( (2 - 4)^2 + (-2 - 8)^2) =
= √( (- 2)^2 + (- 10)^2) =
= √(4 + 100) =
= √104 = 2√26