Find the value of k , if -1 is a zero of a polynomial q(x)= kx^2-4x+k
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-1-
k (-1)^2-4 (-1)+k
=k^2+4+k
=k^2+k=4
=>k=2
k (-1)^2-4 (-1)+k
=k^2+4+k
=k^2+k=4
=>k=2
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