Répondre :
Bonjour;
(2x+3)x2+(2x+3)(5x-7)
=4x +6 +10x² -14x +15x -21
= 10x² +5x -15
si x2 = x²
(2x+3)x²+(2x+3)(5x-7)
= 2x³ +3x² +10x² -14x +15x -21
= 2x³ +13x² +x -21
Bonjour;
(2x+3)x2+(2x+3)(5x-7)
=4x +6 +10x² -14x +15x -21
= 10x² +5x -15
si x2 = x²
(2x+3)x²+(2x+3)(5x-7)
= 2x³ +3x² +10x² -14x +15x -21
= 2x³ +13x² +x -21