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Obiettivo 3<br />

Risolubil<strong>it</strong>à per radicali: Gli zeri di un polinomio<br />

f = x 2 + a1 x + a0<br />

di grado 2 su Q si determinano con una formula in cui<br />

intervengono solo le quattro operazioni e radici quadrate:<br />

α1 = − a1<br />

2 +<br />

a1 2<br />

4 − a0, α2 = − a1<br />

2 −<br />

<br />

a1 2<br />

− a0<br />

4

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