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p = (x₁ + x₂)/2 = -½
współrzędne wierzchołka: (-½; -3)
y = a(x-2)(x+3)
-3 = a(-½-2)(-½+3)
-3 = -6¼a
a = 25/12
a(x-2)(x+3)= a(x²+x-6)=ax²+ax-6a
obliczamy wierzcholek ze wzoru -b/2a = -a/2a= -1/2
f(-0.5) = -3
1/4a -1/2a -6a=-3
a(-6,25)=-3
a=0,48 = 12/25
0.48x²+0.48x -2.88