conic-section

Question: The line $y=mx+c$ touches the parabola ${{x}^{2}}=4ay$ , if



1) $c=-am$
2) $c=-a/m$
3) $c=-a{{m}^{2}}$
4) $c=a/{{m}^{2}}$
Solution: Explanation: No Explanation
Parabola

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