Bonjour !
[tex]A=2(x + 6) \\ = 2x + 12[/tex]
[tex]B=x(3x - 4) \\ = 3 {x}^{2} - 4x[/tex]
[tex]C=(2x + 3)(x + 8) \\ = 2 {x}^{2} + 16x + 3x + 24 \\ = 2 {x}^{2} + 19x + 24[/tex]
[tex]D=(5x - 4)(3x + 5) \\ = 15 {x}^{2} + 25x - 12x - 20 \\ = 15 {x}^{2} + 13x - 20[/tex]
[tex]E=( - 2x + 3)(3x - 6) \\ = - 6 {x}^{2} + 12x + 9x - 18 \\ = - 6 {x}^{2} + 21x - 18[/tex]
[tex]F=( 3x - 4)( - 2x - 8) \\ = - 6 { {x}^{2} } -2 4x + 8x + 32 \\ = - 6 {x}^{2} - 16x + 32[/tex]
Bonne journée
