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p=1/2*(1-5)=-2
q=f(-2)=2(-2-1)(-2+5)=-18
a=2>0
ZW=<-18, +∞)
2.
p=-4, q=-5, a=-2<0 ramiona paraboli w dol.
max=f(-4)=-5
funkcja rosnaca dla x∈(-∞, -4>