Réponses

2014-05-21T14:28:39+02:00
A) 4(2a +5) -5(3a -2)
= 8a +20 -15a +10
= -7a +30

b) 5(2x -4) -2(3-2x)
= 10x -20 -6 +4x
= 14x -26

c) 4(3t+2) -2 (-4t-6)
= 12t +8 +8t +12
= 20t +20

d) -5x(2x +6) +3x(x-3)
= -10x² -30x +3x² -9x
= -7x² -39x