Réponses

2013-12-04T22:38:00+01:00
A = 6x²-2x+15x-5 + 9x²-6x+1
A = 15x²+7x-4

Pour x=6
A= 540 +42 -4
A= 578
2013-12-04T23:04:58+01:00
A=(3x - 1) (2x + 5) + (3x - 1)²
=6x²+15x-2x-5+9x²-6x+1
=15x²+7x-4

pour x=6
15*6²+7*6-4
=15*36+42-4
=540+42-4
=582-4
=578