On the same axes, sketch and label \(y=3x^2-9\) and \(y=\frac13x^2-9\), showing how each compares with the given graph.
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Answer:(a) \(x=0\); (b) \((-3,0),(3,0)\). (c) \(y=3x^2-9\) is narrower with roots \(x=\pm\sqrt3\); \(y=\frac13x^2-9\) is wider with roots \(x=\pm3\sqrt3\).