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Directrix of a parabola given by a general equation (complete the square)

This type of question, asked 2 times: 26 Apr 2025 S1, 15 May 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    26 Apr 2025 S1

    111
    The equation of the directrix of the parabola y2+4y+4x+2=0y^{2}+ 4y+ 4x+ 2 = 0 is

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  2. Question 2

    15 May 2026 S2

    62
    The equation of the directrix of the parabola x2−4x−5y−1=0x^2 - 4x - 5y - 1 = 0 is...

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