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The product of the roots of a quadratic equation ax²+bx+c=0 is  \frac{c}{a} .
If the roots are reciprocal of each other (say m and  \frac{1}{m} ) their product will be 1. So 
 \frac{c}{a}=1 \\  \frac{k}{2} = 1 \\ k=2
1 5 1
Given roots are p,1/p
product of roots=c/a