Q.The equation $12x^2 + 7xy - 12y^2 + 13x + 45y + c = 0$ represents a pair of straight lines if c equals

156

-156

144

-144

The correct solution involves applying the fundamental concept to derive the final value step by step...

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Q.The equation 12x2+7xy−12y2+13x+45y+c=012x^2 + 7xy - 12y^2 + 13x + 45y + c = 012x2+7xy−12y2+13x+45y+c=0 represents a pair of straight lines if c equals