A line y=mx through origin cuts the para...

A line `y=mx` through origin cuts the parallel lines `x+y=3` and `x+y=5` at A and B respectively. The distance between the two points of intersection is d, the relation between d and m is
`(1/(1+m))^2 + (m/(1+m))^2 = d^2/K`, then the value of `K^2 +K-19` is

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