circle

Question: If line $ax+by=0$ touches ${{x}^{2}}+{{y}^{2}}+2x+4y=0$ and is a normal to the circle ${{x}^{2}}+{{y}^{2}}-4x+2y-3=0$ , then value of (a,b) will be



1) (2, 1)
2) (1, –2)
3) (1, 2)
4) (–1, 2)
Solution: Explanation: No Explanation
Tangent and normal to a circle

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