Réponse :
Bonjour,
Développer et réduire:
A = 5x – (4x – 7) + 3
= 5x – 4x + 7 + 3
= x + 10
B = 2 – 5x(3x – 7) + 6x
= 2 – 15x² + 35x + 6x
= –15x² + 41x + 2
C = (9x – 2)(5x² – 4)
= 45x³ – 36x – 10x² + 8
= 45x³ – 10x² – 36x + 8
Factoriser:
D = 32x + 24xy
= 8x × 4 + 8x × 3y
= 8x(4 + 3y)
E = (2x – 5)² – (2x – 5)(3x – 7)
= (2x – 5)(2x – 5) – (2x – 5)(3x – 7)
= (2x – 5)[(2x – 5) – (3x – 7)]
= (2x – 5)(2x – 5 – 3x + 7)
= (2x – 5)(–x + 2)
