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(a,0) dengan x=a, y=0
a^2 + 0 + 6a - 0 = 0
a^2 + 6a = 0
a(a+6)=0
a=0 , a=-6
(0,b) dengan x=0, y=b
0 + b^2 + 0 - 4b = 0
b^2 - 4b = 0
b(b-4)=0
b=0 , b=4
Hasilnya, a1 = 0 , a2 = -6 b1 = 0 b2 = 4
a1+a2+b1+b2 = 0 - 6 + 0 + 4 = -2
Answer (-2)