How is this possible?

Geometry Level 4

In the figure, \(\angle ADC=\angle BCD=90^\circ\), \(AD \parallel EF \parallel BC\), \(AC=7\), \(BD=3\) and \(EF=2\). If \(P(x)\) is the minimal monic polynomial with integer coefficients which has \(CD\) as one of its roots, find \(P(1)\).

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