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f(1) = -2*1² + 3*1 - 1 =-2+3-1=0
f(3) =-2*3² + 3*3 - 1=-18+9-1=-10
Δ=9-8=1
q=-Δ/4a
q=-1/4*(-2)=1/8
zbiór wartości tej funkcji
y∈<-10,1/8>