Question

Por favor me ajudem!!​

Answer 1

Resposta:

$a) \: ( {a - 2)}^{2} - 2 \times (a + 2) \\ {a}^{2} - 4a + 4 - 2a - 4 \\ {a}^{2} - 6a$

$b) \: {(y + 5)}^{2} - y \times (y + 10) \\ {y}^{2} + 10y + 25 - {y}^{2} - 10y \\ 25$

$c) \: {(a + b)}^{2} + {(a - b) }^{2} \\ {a}^{2} + 2ab + {b}^{2} + {a}^{2} - 2ab + {b}^{2} \\ 2 {a}^{2} + 2 {b}^{2}$

$d) \: {(x - 3)}^{2} + {(x + 3)}^{2} \\ {x}^{2} - 6x + 9 + {x}^{2} + 6x + 9 \\ 2 {x}^{2} + 18$

$e) \: (x + y) \times (x - y) + {(x + y)}^{2} - 2xy \\ {x}^{2} - xy + xy - {y}^{2} + {x}^{2} + 2xy + {y}^{2} - 2xy \\ 2 {x}^{2}$