Réponse:
bonsoir
A = (2x + 1)(3x + 4)
= 2x × 3x + 2x × 4 + 1× 3x + 1×4
= 6x² + 8x + 3x + 4
= 6x² + 11x + 4
B = (3x + 1)²
= ((3x)² + 2×3x×1 + 1²)
= 9x² + 6x + 1
C = (4 - 5x)(4 + 5x)
= 4 × 4 -5x × 5x
= 16 - 25x²
Bonsoir,
A = (2x + 1)(3x + 4)
= 6x² +8x +3x +4
= 6x² +11x +4
B = (3x + 1)
Il manque quelque chose.
C = (4 - 5x)(4 + 5x)
= 16 +20x - 20x - 25x²
= - 25x² + 16