[tex] {c}^{2} - 7 = {c}^{2} - ( \sqrt{7} ) {}^{2} = (c - \sqrt{7} )(c + \sqrt{7} )[/tex]
Ответ: 2)
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[tex] {c}^{2} - 7 = {c}^{2} - ( \sqrt{7} ) {}^{2} = (c - \sqrt{7} )(c + \sqrt{7} )[/tex]
Ответ: 2)