Question: wo runners left an intersection at the same time, one heading south and the other due east. Some time later they were 13 km apart.

wo runners left an intersection at the same time, one heading south and the other due east. Some time later they were 13 km apart. The runner heading south had gone 7 km further than the runner heading east. Set up a quadratic equation in standard form for the distance travelled by runner heading east. Name the law/theorem you used

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