Verified answer

Ответ:

[tex](6a-12b)^2=36a^2-144ab+144b^2\\(5a-7c)^3=125a^3-525a^2c+735ac^2-343c^3[/tex]

Объяснение:

[tex]\boxed {\bf (a-b)^2=a^2-2ab+b^2~;~(a-b)^3=a^3-3a^2b+3ab^2-b^3} .[/tex]