Find the value of k if x=4 is a factor of 2x^2+kx-1
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P (4)= 0
or 2 (4)^2+4k-1=0
or 32+4k-1=0
or 4k=-31
or k=-31/4
or 2 (4)^2+4k-1=0
or 32+4k-1=0
or 4k=-31
or k=-31/4
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