If the line \[y=2x+c\] be a tangent to the ellipse \[\frac{{{x}^{2}}}{8}+\frac{{{y}^{2}}}{4}=1\], then \[c=\] [MNR 1979; DCE 2000]

If the line \[y=2x+c\] be a tangent to the ellipse \[\frac{{{x}^{2}}}{

1.	If the line \[y=2x+c\] be a tangent to the ellipse \[\frac{{{x}^{2}}}{8}+\frac{{{y}^{2}}}{4}=1\], then \[c=\] [MNR 1979; DCE 2000]
A.	\[\pm 4\]
B.	\[\pm 6\]
C.	\[\pm 1\]
D.	\[\pm 8\]
Answer» C. \[\pm 1\]

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If the line \[y=2x+c\] be a tangent to the ellipse \[\frac{{{x}^{2}}}{8}+\frac{{{y}^{2}}}{4}=1\], then \[c=\] [MNR 1979; DCE 2000]

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