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y=a(x-x1)*+y1
y=a(x-2)*-5
melalui (0,3)
y=a(x-2)*-5
-3=a(0-2)*-5
-3+5=4a
2=4a
a=1/2
so,
y=a(x-2)*-5
y=1/2(x*-4x+4)-5
y=1/2x*-2x+2-5
y=1/2x*-2x-3
ket: *=kuadrat