Question:
The line ax+by=1 cuts ellipse cx²+dy²=1 only once if
The line ax+by=1 cuts ellipse cx²+dy²=1 only once if
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Tangency gives discriminant zero condition.
Updated On: Mar 18, 2026
- ca²+db²=1
- (c)/(a²)+(d)/(b²)=1
- (a²)/(c)+(b²)/(d)=1
- a²c+b²d=1
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Tangency condition for ellipse.
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