If line \[x=my+k\] touches the parabola \[{{x}^{2}}=4ay\], then \[k=\] [MP PET 1995]

If line \[x=my+k\] touches the parabola \[{{x}^{2}}=4ay\], then \[k=\]

1.	If line \[x=my+k\] touches the parabola \[{{x}^{2}}=4ay\], then \[k=\] [MP PET 1995]
A.	\[\frac{a}{m}\]
B.	am
C.	\[a{{m}^{2}}\]
D.	\[-a{{m}^{2}}\]
Answer» B. am

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If line \[x=my+k\] touches the parabola \[{{x}^{2}}=4ay\], then \[k=\] [MP PET 1995]

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