Réponse :
Bonjour,
[tex]A(x) = 2x(x + 1)\\\\= 2x^2 + 2x[/tex]
Vérification:
[tex]Pour \ x = 2\\\\2 \times 2 \times (2 + 1) = 4 \times 3 = 12\\\\2 \times 2^2 + 2 \times = 2 \times 4 + 2 \times 2 = 8 + 4 = 12[/tex]
[tex]B(x) = (x + 2)(-3x + 4)\\\\= -3x^2 + 4x - 6x + 8\\\\= -3x^2 - 2x + 8[/tex]
Vérification:
[tex]Pour \ x = 2\\\\(2 + 2) \times (-3 \times 2 + 4) = (2 + 2) \times (-6 + 4) = 4 \times (-2) = -8\\\\-3 \times 2^2 - 2 \times 2 + 8 = -3 \times 4 - 2 \times 2 + 8 = -12 - 4 + 8 = -16 + 8 = -8[/tex]
