Réponses

Meilleure réponse !
2014-06-03T14:05:05+02:00
A) 4(5a+3)                        
   4x5a + 4x3 
    20a + 12 

b) -4(2x -3)
(-4) x 2x + (-4) x (-3) 
-8x + 12 

c) (5x + 3) ( 2x + 1)
 5x X 2x + 5x X 1 + 3 X 2x + 3 X 1
10x² + 5x + 6x + 3
10x² + 11x + 3



c) (5x + 3) ( 2x + 1) 5 5x X 2x + 5x X 1 + 3 X 2x + 3 X 1 10x² + 5x + 6x + 3 10x² + 11x + 3
2014-06-03T16:35:22+02:00
4(5a+3) = 20a +15
-4(2x-3) = -8x +12
(5x +3)(2x+1) 
10x² +5x +6x +3
10x² +11x +3
(x-2)(3x-4)
3x² -4x -6x +8
3x² -10x +8
3(x² -2) -5x (x-6)
3x² -6 -5x² +30x
-2x² +30x -6