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Verified answer
-b/2a=4-(3a-20)/(2(a-3))=4
-3a+20=8a-24
44=11a
a=4
f(x)=x²-8x-36
y=-D/4a=-(b²-4ac)/4a=-((-8)²-4(1)(-36))/4(1)=-52
jadi, nilai ekstrim P(x;y) =>(4;-52)