A parabola can be represented by the equation y squared is equal to negative x What are the coordinates of the focus and the equation of the directrix?

Compare y² = −x with the standard form y² = 4px. Since 4p = −1, p = −1/4, so the focus is (−1/4, 0) and the directrix is x = −p = 1/4. This matches choice A.

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