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            <video:description>Les solutions de l&#39;équation  -3x² + 10x - 3 = 0, puis celles de l&#39;équation  3x² - 10x + 3 = 0.</video:description>
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            <Attribute name="description">Le discriminant et le nombre de racines réelles d&#39;une équation du second degré. Exemple : le nombre de racines de l&#39;équation x² + 14x + 49 = 0.</Attribute>
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            <video:description>Le discriminant et le nombre de racines réelles d&#39;une équation du second degré. Exemple : le nombre de racines de l&#39;équation x² + 14x + 49 = 0.</video:description>
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