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Ответ:

[tex]( {c}^{4} - 5)(3 - c) - (7c + 1)(8 + {c}^{4} ) = 3 {c}^{4} - {c}^{5} - 15 + 5c - (56c + 7 {c}^{5} + 8 + {c}^{4} ) = 3 {c}^{4} - {c}^{5} - 15 + 5c - 56c - 7 {c}^{2} - 8 - {c}^{4} = 3 {c}^{4} - {c}^{5} - 23 - 51c - 7 {c}^{2} - {c}^{4} [/tex]

[tex]3 \times {2}^{4} - {2}^{5} - 23 - 51 \times 2 - 7 \times {2}^{2} - {2}^{4} = 48 - 64 - 23 - 102 - 28 - 16 = - 281[/tex]