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x1=2
x2=6
postac iloczynowa:
y=a(x-2)(x-6)
podstawiam współrzędne punktu A:
-6=a(3-2)(3-6)
-6= a* 1 * (-3)
-3a=-6 /:(-3)
a=2
więc:
y=2(x-2)(x-6)=2(x^2-6x-2x+12)=
=2x^2-16x+24