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6+mx≥0
mx≥-6
x≥-6/m
-6/m=12
12m=-6
m=-1/2
27.
p=-b/2a
p=4/2=2
Po lewej stronie wierzcholka funkcja jest rosnaca (a<0)
min=f(-1)=-1-4-3=-8
max=f(1)=-1+4-3=0