Bonsoir,
Résoudre
36x²-9 = 0
9 (2x - 1) (2x + 1) = 0
2x - 1 = 0 ou 2x + 1 = 0
2x = 1 2x = - 1
x = 1/2 x = - 1/2
1) Factoriser
A = (7t+2)(4t-5) + 8t(4t-5)
A = (4t - 5) (7t + 2 + 8t)
A = (4t - 5) (15t + 2)
2) Résoudre A = 0.
A = (4t - 5) (15t + 2) = 0
4t - 5 = 0 ou 15t + 2 = 0
4t = 5 15t = - 2
t = 5/4 t = - 2/15.
