1)
[tex] {b}^{2} - 49 = (b - 7)(b + 7)[/tex]
2)
[tex] {c}^{2} - 8c + 16 = {(c - 4)}^{2} [/tex]
3)
[tex] {b}^{3} - 8 {c}^{3} = (b - 2c)( {b}^{2} + 2bc + 4 {c}^{2} )[/tex]
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Answers & Comments
1)
[tex] {b}^{2} - 49 = (b - 7)(b + 7)[/tex]
2)
[tex] {c}^{2} - 8c + 16 = {(c - 4)}^{2} [/tex]
3)
[tex] {b}^{3} - 8 {c}^{3} = (b - 2c)( {b}^{2} + 2bc + 4 {c}^{2} )[/tex]