Quadratic equation explained by our 13 year old daughter

When would you use a quadratic equation? We tried to find a practical example, where you could use quadratic equations in real life. It was a good  opportunity to work with quadratic equations and get a wider understanding of equations generally.

Pour a concrete slab around a swimming pool. The pool measures 5m * 3m, and you can make a 48m² terrace with one pallet of cement. Calculate how wide the terrace should be all the way around. It must be the same width on all sides.

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