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[" 64.The equation of the parabola whose...

[" 64.The equation of the parabola whose vertex is "(a,0)" ,"],[" and the directrix has the equation "x+y=3a" ,is "],[" (a) "x^(2)+y^(2)+2xy+6ax+10ay-7a^(2)=0],[" (b) "x^(2)-2xy+y^(2)+6ax+10ay-7a^(2)=0],[" (c) "x^(2)-2xy+y^(2)-6ax+10ay-7a^(2)=0],[" (d) none of these "]

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