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What is the condition of tangency of a line y=mx+c on parabola with vertex(h,k) ,say for parabola (y-k)

I could only find the condition of tangency on standard form of parabola, in the internet?

Thank you.

What is the condition of tangency of a line y=mx+c on parabola with vertex(h,k) ,say for parabola (y-k)

^{2}=4a(x-h)?I could only find the condition of tangency on standard form of parabola, in the internet?

Thank you.

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