[tex]a = (x +2) \times (6x + 1) \\ = 6 {x}^{2} + x + 12x + 2 \\ = 6 {x + 13x + 2}^{2} [/tex]
[tex]b= (2x + 2) \times (3x + 1) \\ = 6 {x}^{2} + 2x + 6x + 2 \\ = 6 {x}^{2} + 8x + 2 \\ [/tex]
Je ne sais pas pour la calcule D
[tex]c = (x + 1) \times ((x + 2) + (2x + 2) + 3x + 1)) \\ = (x + 1) \times (x + 2 + x + x + 2 + 3x + 1) \\ = (x + 1) \times (6x + 5) \\ = 6 {x}^{2} + 5x + 6x + 5 \\ = 6 {x}^{2} + 11x + 5[/tex]
[tex]e = (x + 1) \times (x + 2) + ((2x + 2) + 3x + 1)) \times ((4x + 1) - (x + 1)) \\ = (x + 1) \times (x + 2) + (2x + 2 + 3x + 1) \times 4x + 1 - x + 1 \\ = {x}^{2} + 2x + x + 2 + (5x + 3) \times (3x + 2) \\ = {x}^{2} + 3x + 2 + 15 {x}^{2} + 10x + 9x + 6 \\ = 16 {x}^{2} + 22x + 8[/tex]
