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f(0)=-5
-5=a(0)²+b(0)+c
-5=c
f(x)=ax²+bx-5
f(6)=-5
-5=a(6)²+b(6)-5
36a+6b=0
6(6a+b)=0
b=-6a
p=-b/2a=6a/2a=3
q=4
f(3)=4
4=a(3)²-6a(3)-5
4=9a-18a-5
9=-9a
a=-1
b=6
f(x)=-x²+6x-5=-(x-3)²+4