Ответ:

1)

[tex](4x ^{3} - 7y^{2} x ^{4} ) ^{2} = 16x ^{6} - 56x ^{7} y^{2} + 49y ^{4} x ^{8} [/tex]

2)

[tex](4а ^{3} + 5c)^{2} = 16a^{6} + 40а ^{3} c + 25c^{2}[/tex]

[tex](3a ^{2} - 4x ^{5} ) = 9a ^{4} - 24a ^{2} x ^{5} + 16x ^{10} [/tex]