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The equation 3x^2+4y^2-18x+16 y+43=k (a...

The equation `3x^2+4y^2-18x+16 y+43=k` (a)represents an empty set, if `k<0` (b)represents an ellipse, if `k >0` (c)represents a point, if `k=0` (d)cannot represent a real pair of straight lines for any value of `k`

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