Réponse:
Exercice 7 :
[tex]k \: = x^{2} - 8x + 16 \\ [/tex]
[tex]l \: = {x}^{2} + 6x \: + 9[/tex]
[tex]m = x^{2} - 25[/tex]
[tex]n = 4 {y}^{2} - 49[/tex]
[tex]o = 9x^{2} +66x + 121[/tex]
[tex]p = 4 - 40x + 25 {x}^{2} [/tex]
[tex]q = 1 \\ ( \sqrt{3} )^{2} = 3 \\ ( \sqrt{2} )^{2} = 2[/tex]
[tex]r = 4 {x}^{2} + 20x + 25 - 20x - 5 \\ = 4 {x }^{2} + 20[/tex]
Exercice 8 :
[tex]s = (x+3)^2[/tex]
[tex]t = (x-5)^2[/tex]
[tex]u = (x+8)(x-8)[/tex]
[tex]v = je \:ne \:sais \:pas[/tex]
[tex]w = (x+2)^2[/tex]
[tex] x = (7x-5)^2[/tex]
[tex]y = (2x+3)(2x-3)(3x-1) \: (je\:ne \:suis \:pas \:sure)[/tex]
[tex]z = (5x-1)(2x-1)(5x+1)[/tex]
