\(x\) is directly proportional to \({{(y-3)}^{2}}\) and \(y\) is positive. The table below shows some corresponding values of \(x\) and \(y\).
| \(x\) | \(a\) | \(2\) | \(72\) |
|---|---|---|---|
| \(y\) | \(1.2\) | \(5\) | \(b\) |
Find the
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