Sagot :
1)=2x²+12x+14x-4x+21x-6
=2x²+43x-6
2)=(2x+3)(2x+3+7x-2)
=(2x+3)(9x+1)
3)=2*4²+43*4-6
=2*16+172-6
=32+166
=198
)=2x²+12x+14x-4x+21x-6
=2x²+43x-6
2)=(2x+3)(2x+3+7x-2)
=(2x+3)(9x+1)
3)=2*4²+43*4-6
=2*16+172-6
=32+166
=198
Voila ! :)
Bonsoir,
Soit D=(2x+3)² + (2x+3) (7x-2).
1) Développer et réduire D.
2) Factoriser D.
3) Calculer D pour x=-4.
1)=2x²+12x+14x-4x+21x-6
=2x²+43x-6
2)=(2x+3)(2x+3+7x-2)
=(2x+3)(9x+1)
3)=2*4²+43*4-6
=2*16+172-6
=32+166
=198
)=2x²+12x+14x-4x+21x-6
=2x²+43x-6
2)=(2x+3)(2x+3+7x-2)
=(2x+3)(9x+1)
3)=2*4²+43*4-6
=2*16+172-6
=32+166
=198