Q.The equation $x^2 + 4xy + 4y^2 - 4x - 8y + k = 0$ represents a pair of straight lines if k equals

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Q.The equation x2+4xy+4y2−4x−8y+k=0x^2 + 4xy + 4y^2 - 4x - 8y + k = 0x2+4xy+4y2−4x−8y+k=0 represents a pair of straight lines if k equals