What is the focal length of the parabola ?

Answer and explanation

Correct answer: D.

  1. Step 1: In standard form , the focal length is the distance from vertex to focus.
  2. Step 2: Equate .
  3. Step 3: Solve for : .
Answer
.
Why not the others: '' divides 8 by 2 instead of 4; '' uses the coefficient directly; '' divides by 2.

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