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Δ=b²-4ac=16-40=-24
Δ<0 brak pierwiastków, czyli nie można zapisac postaci iloczynowej
p=-b/2a=4/4=1
q=-Δ/4a=24/8=3
y=a(x-p)²+q
y=2(x-1)²+3= postac kanoniczna