Bonjour,

(3x+2)(x+4) = 3x²+12x+2x+8 = 3x²+14x+8

(x+3)(x-2) = x²-2x+3x-6 = x²+x-6

(2x+4)(x-3) = 2x²-6x+4x-12 = 2x²-2x-12

(x-5)(x-2) = x²-2x-5x+10 = x²-7x+10

(3-2x)(x+1) = 3x+3-2x²-2x = -2x²+x+3

bjr

K = (3x+2)(x+4)

  = 3x*x + 3x*4 + 2*x + 2*4

  = 3x² +   12x   + 2x   + 8

  = 3x² + 14x + 8

M =(x+3)(x-2)

   = x*x + x*(-2) + 3*x + 3*(-2)

   = x²     -  2x   + 3x     - 6

   = x²  + x - 6

O =(2x+4)(x-3)

   = 2x*x + 2x*(-3) + 4*x + 4*(-3)

   = 2x²   -    6x     + 4x    -12

tu finis

L =(x-5)(x-2)

   = x*x + x*(-2) - 5*x - 5*(-2)

   = x²   - 2x      - 5x   +10

tu finis

N =(3-2x)(x+1) = 3*x + 3*1 - 2x*x - 2x*1   tu finis