the equation to the pair of straight lines through the origin and perpendicular to 2x²−4xy−7y2=0 is
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the equation to the pair of straight lines through the origin and perpendicular to 2x²−4xy−7y2=0 is
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We can get equation of pair of line interchanging coefficients of x2 and y2 and changing sign of xy term
Hence required equation is
−3x2+7xy+5y2=0⇒3x2−7xy−5y2=0