Bonjour !
[tex]C=(2x+5)(3x+7) \\ = 6 {x}^{2} + 14x + 15x + 35 \\ = 6 {x}^{2} + 29x + 35[/tex]
[tex]D=(x+1)(x+5) \\ = {x}^{2} + 5x + x + 5 \\ = {x}^{2} + 6x + 5[/tex]
[tex]E=(4x+5)(2x+6) \\ = 8 {x}^{2} + 24x + 10x + 30 \\ = 8 {x}^{2} + 34x + 30[/tex]
[tex]F=(2+x)(5x+4) \\ = 10x + 8 + 5 {x}^{2} + 4x \\ = 5 {x}^{2} + 14x + 8[/tex]
Bonne journée
