Problem 55 of 7
Identify focus and directrix from parabola y^2=-12x.
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read vertex and p-value.
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Equation must be in focus-directrix standard form or a scaled equivalent.
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Solution
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1. Identify vertex from standard form.
2. Compute p from the coefficient 4p.
3. Move p units from vertex to focus and opposite direction to directrix.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Confusing 4p with p.