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x1x2 = -6
(x1-3)+(x2-3) = (x1+x2)-6 = -10
(x1-3)(x2-3) = x1x2-3(x1+x2)+9 = -6-3(-4)+9 = -9
PKB
x²-((x1-3)+(x2-3))x+(x1-3)(x2-3)=0
x²+10x-9=0
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