Réponses

2014-01-26T17:48:23+01:00
- ( 2b+6)(6-6b) + (2b-3)(8 -9b)
- ( 12b -12b² +36 -36b) + ( 16b -18b² -24 +27b)
- ( -24b -12b² +36) + (-18b² +43b -24)
+ 24b +12b² -36 -18b² +43b -24
-6b² + 67b -60
2014-01-26T17:52:34+01:00
-(2b+6)(6-6b)+(-2b-3)(8-9b)
= -(2b²+b²-12b²+6b²)+(-16b--18b²-24-27b)
= -2b²-b²+12b²-6b²-16b+18b²-24-27b
= 21b²-43b -24