Ответ:
[tex](k+6)^{2}-2k*(-3k+6)= (k+6)(k+6)-2k*(-3k+6)=(k^{2} +6k+6k+36)+6k^{2} -12k=k^{2} +12k+36+6k^{2} -12k=7k^{2} +36[/tex]
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Ответ:
[tex](k+6)^{2}-2k*(-3k+6)= (k+6)(k+6)-2k*(-3k+6)=(k^{2} +6k+6k+36)+6k^{2} -12k=k^{2} +12k+36+6k^{2} -12k=7k^{2} +36[/tex]