FP1.4.3 - Focus-directrix property of the parabola

The focus-directrix property of the Concept of focus and directrix and parabola as locus of parabola. points equidistant from focus and directrix.

Use fp1.4.3 - focus-directrix property of the parabola to connect the rule to the data and decision in the question.

This matters because fp1.4.3 - focus-directrix property of the parabola determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply fp1.4.3 - focus-directrix property of the parabola to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: FP1.4.3 - Focus-directrix property of the parabola is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.