Direct polynomial variation

Direct polynomial variation

Secondary 2
TGM Original Questions

The quantity \(y\) is directly proportional to \(x^3+2\).

  1. Given \(y=30\) when \(x=2\), express \(y\) in terms of \(x\).
  2. Find \(y\) when \(x=3\).
  3. Find \(x\) when \(y=9\).

Solution:

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Answer:(i) \(y=3(x^3+2)\); (ii) \(y=87\); (iii) \(x=1\).

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