Answer:
[tex]7(a - {3b)}^{3} - 28(a - 3b) \\ 7( {a}^{3} - {9a}^{2}b + {27ab}^{2} - {27b}^{3}) - 28(a - 3b)[/tex]
[tex] \boxed{ ans = {7a}^{3} + {189ab}^{2} - {189b}^{3} - {63ba}^{2} - 28a + 84b}[/tex]
hope it's help you
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Answer:
[tex]7(a - {3b)}^{3} - 28(a - 3b) \\ 7( {a}^{3} - {9a}^{2}b + {27ab}^{2} - {27b}^{3}) - 28(a - 3b)[/tex]
[tex] \boxed{ ans = {7a}^{3} + {189ab}^{2} - {189b}^{3} - {63ba}^{2} - 28a + 84b}[/tex]
hope it's help you