Réponse:
A(-1)=
[tex](9 \times ( - 1) + 2) {}^{2} - 49 = {( - 9 + 2)}^{2} - 49 = {( - 7)}^{2} - 49 = 49 - 49 = 0[/tex]
[tex] {(9x)}^{2} + 2 \times 9x \times 2 + {2}^{2} - 49 = 81 {x}^{2} + 36x + 4 - 49 = 81 {x}^{2} + 36x - 45[/tex]
[tex] {(9x + 2)}^{2} - {7}^{2} = (9x + 2 - 7)(9x + 2 + 7) = (9x - 5)(9x + 9)[/tex]
