For part (c) of question thirteen am I only required to find the gradient of RU and prove that is it zero? This is how I have interpreted this question.
ANY help on the matter is much appreciated thank you in advance.
2026-04-02 16:42:39.1775148159
If PQis a focal chord, show that the interval RU is parallel to the axis of the parabola.
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hint...The focal chord property is $pq=-1$, whereupon you can calculate the gradient of $RU$...