If the diagonals of the quadrilateral formed by the lines l−1x+m1y+n – InterviewSolution

1.	If the diagonals of the quadrilateral formed by the lines l−1x+m1y+n1=0,l2x+m2y+n2=0,l1x+m1y+n′1=0 and (l2x+m2y+n′2=0are perpendicular,then write the value of l21−l22+m2−m22
Answer» If the diagonals of the quadrilateral formed by the lines $l - 1 x + m_{1} y + n_{1} = 0, l_{2} x + m_{2} y + n_{2} = 0, l_{1} x + m_{1} y + n_{1}^{'} = 0$ and $(l_{2} x + m_{2} y + n_{2}^{'} = 0$ are perpendicular,then write the value of $l_{1}^{2} - l_{2}^{2} + m_{2} - m_{2}^{2}$

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