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If y=2x+c is tangent to the circle x^(2)...

If `y=2x+c` is tangent to the circle `x^(2)+y^(2)=16` find c.

A

2a, 4, 1

B

2a, 8, 1

C

a, 4, 1

D

a, 4, 2

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
The line `y=mx+c` is tangent to hyperbola `(x^(2))/(a^(2))-(y^(2))/(b^2)=1.`
if `c^(2)=a^(2)m^(2)-b^(2)`.
Given tangent is : `y=2x+1`
`therefore" "(1)^(2)=4a^(2)-16`
`rArr" "a^(2)=(17)/(4)`
`rArr" "a^(2)=(sqrt(17))/(2)`
For option (1), sides are `sqrt(17),4,1,` which form right angled triangle.
For option (2), sides are `sqrt(17),8,1,,` for which triangle is not possible.
For option (3), sides are `(sqrt(17))/(2),4,1,` for which triangle is not possible.
For option (4), sides are `(sqrt(17))/(2),4,2,` for which triangle exists but not right angled.
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