Help not much time.
2 answers:
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Check the picture below, so the parabola looks more or less like so.
the vertex is always half-way between the focus point and the directrix, and since the parabola is opening downwards, the "p" distance is negative.
On simplification, the expression is equal to 10/(x + 8)
Step-by-step explanation:
Answer is shown in attachment.
