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=(-4)2-4.1.4/-4.1
=16-4/-4
=12/-4
=-3
a=1 b=-4 c=4
y=a(x+b/2a)-D/4a
y=1(x-4/2.1)-16-16/4
y=(x-2)-20
y=-4x+4-20
y=-4x-16
D/-4a
-16-16/4
-32/4
=-8