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Question

The line y = 2x + c is a tangent to the parabola y2 = 16 x, if c equals

  1. – 2    
  2. – 1    
  3. 0    
  4. 2    

The correct answer is: 2


    line y = 2x + c
    Parabola y2 = 16x
    Comparing with y2 = 4ax
    4a = 16 rightwards double arrow a = 4
    Condition of tangency c = fraction numerator a over denominator m end fraction, c = fraction numerator 4 over denominator 2 end fraction = 2

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