Réponse:
bonsoir
1. f(t) = (3t + 2)² = 9
((3t)² + 2×3t×2 +2²) = 9
9t² +12t + 4 = 9
2. 9t² + 12t + 4 = 9
9t² + 12t + 4 - 9 = 0
9t² + 15t -3t -5 = 0
3t × (3t + 5) - (3t + 5)
(3t + 5)(3t - 1)
