\[\boxed{\text{634\ (634).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ (4a + 3b)^{2} - 8b(4a + b) =\]
\[= 16a^{2} + 24\text{ab} + 9b^{2} - 32\text{ab} - 8b^{2} =\]
\[= 16a^{2} - 8\text{ab} + b^{2} = (4a - b)^{2}\]
\[= 36x^{2} + 60xy + 25y^{2} =\]
\[= (6x + 5y)²\]