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y=(x-1)²
a=1>0 i q=0
ZW=<0,+∞)
b)
a=-3<0 i q=-3
ZW=(-∞,-3>
c)
y=-x²+x+6
p=-b/2a
p=1/2
max=f(1/2)=-(-2,5)*2,5=6,25
ZW=(-∞, 6,25>
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