Width of an arch from a quadratic model

Width of an arch from a quadratic model

Secondary 3
TGM Original Questions

The height of an arch is modelled by \(h=-0.5(x-4)^2+8\), where \(x\) and \(h\) are in metres. Find the horizontal width of the arch at height \(6\) m.

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Answer:\(4\) m.

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