Explicación paso a paso:
[tex] {b}^{2} - 14b + 49 = (b - 7)(b - 7) \\ = ( {b - 7)}^{2} [/tex]
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Explicación paso a paso:
[tex] {b}^{2} - 14b + 49 = (b - 7)(b - 7) \\ = ( {b - 7)}^{2} [/tex]