The value of k for which the polynomial x cube-three into x square+three into x +k has 3 as its zero is
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X3-3x2+3x+k=0
Given 3 is zero of given polynomial we will put x=3 in given equation
=> (3)^3-3(3)^2+3(3)+k=0
=> 27-27+9+k=0
=> k=-9
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