Respuesta :
Respuesta:
1.
[tex] {a}^{2} - 8a + 5a - 40 \\ {a}^{2} - 3a - 40 \\ \\ [/tex]
2.
[tex](xy {)}^{2} - {2}^{2} \\ {x}^{2} {y}^{2} - 4 [/tex]
3.
[tex] {x}^{2} {y}^{2} \times 1 + 2xy \times 2 + 1 \times {2}^{2} \\ {x}^{2} {y}^{2} + 4xy + 4 [/tex]