Ответ:
(k-1)(k+1)-(k-7)(k-5) =k^2 - 1 - (k^2 - 5k - 7k + 35) = k^2 - 1 - (k^2 - 12k + 35) = k^2 - 1 - k^2 + 12k - 35 = -36 + 12k
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Ответ:
(k-1)(k+1)-(k-7)(k-5) =k^2 - 1 - (k^2 - 5k - 7k + 35) = k^2 - 1 - (k^2 - 12k + 35) = k^2 - 1 - k^2 + 12k - 35 = -36 + 12k