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W=(p;q)
p=-b/2a=2/2=1
q=(-delta)/4a=-16/4=-4
W=(1;-4)
y=a(x-p)^2 + q
a=1
y=(x-1)^2-4
b)delta=5^2-4*2*0=25
p=-b/2a=-5/4
q=(-delta)/4a=-25/4
a=2
y=2(x+5/4)^2 - 25/4