Question
Question: The line y = 2x + c is a tangent to the parabola y<sup>2</sup> = 16 x, if c equals...
The line y = 2x + c is a tangent to the parabola y2 = 16 x, if c equals
A
– 2
B
– 1
C
0
D
2
Answer
2
Explanation
Solution
line y = 2x + c
Parabola y2 = 16x
Comparing with y2 = 4ax
4a = 16 Ž a = 4
Condition of tangency c = 
, c = 
= 2