find the value of k, if x-2 is a factor of 5x^3 + 3x^2-20x +k
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The zero of the polynomial x-2 is 2.
p(2)=> 5(2)^3 + 3(2)^2 - 20(2) + k = 0
=> 40 + 12 - 40 + k = 0
=> 12 + k = 0
=> k = -12
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