Sagot :
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
=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