Problem 137 of 7
Correct the focus-directrix derivation error: A student calculates p=5 for the parabola x^2 = -20y.
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
catch distance setup, sign, orientation, and p-value mistakes.
Hidden until you reveal it.
Correction must address distance setup, sign, orientation, or p-value.
Enter your answer
Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Identify whether the error is p-value, direction, distance, or vertex placement.
2. State the correct rule.
3. Apply it to repair the derivation.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Only giving a new equation without identifying the mistake.