好难的美国数学题（D）The product of two of the four roots of the follo

好难的美国数学题（D）
The product of two of the four roots of the following quartic equation is 8 .Find the value of k.
x四次方 - 256 * x的三次方 + kx的平方 - 494x - 2008=0
k是多少?

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2008=251*4*2*1
四个根为－251,－4,－2,1
k＝（－251）（－4）＋（－251）（－2）＋（－251）1＋（－4）（－2）＋（－4）1＋（－2）1＝1257

1年前

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