Problem 46 of 7
Write standard focus-directrix form from vertex (-4,3), orientation opens down, and p-value -1.
Hints
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use (x-h)^2=4p(y-k) or (y-k)^2=4p(x-h).
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Use vertical or horizontal standard form based on orientation and signed p-value.
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Solution
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1. Choose vertical or horizontal form from orientation.
2. Substitute vertex coordinates.
3. Compute 4p and write the equation.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Using p instead of 4p.