Question

me ajuda!!!!!!!!!!!!!!!!!!!!​

Answer 1

Resposta:

$a) \: (x + 9) \times (x - 9) \\ {x}^{2} - 9x + 9x - 81 \\ {x}^{2} - 81$

$b) \: (m + 3) \times (m + 3) \\ {m}^{2} + 3m + 3m + 9 \\ {m}^{2} + 6m + 9$

$c) \: ( {2}^{2} - 5) \times ( {2}^{2} + 5) \\ (4 - 5) \times (4 + 5) \\ - 1 \times 9 \\ = - 9$

$d) \: (3x + 5) \times (3x + 5) \\ 9 {x}^{2} + 15x + 15x + 25 \\ 9 {x}^{2} + 30x + 25$