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對稱軸為x=-3/2,兩根差為7, 則兩根分別為x1=-3/2+7/2=2,x2=-3/2-7/2=-5 由頂點式f(x)=a(x+3/2)^2+49 f(2)=a*49/4+49=0,得:a=-4 故y=f(x)=-4(x+3/2)^2+49=-4x^2-12x+40
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