Besoin d aide exercice 2 merci bcp c est urgent :

1. (2x-5)(3+x) = 6x+2x²-15+5x = 2x²+11x-15
2. x= 1
a).(2x-5)(3+x)
(2*1-5)(3+1) = (2-5)(4) = 8-20 = 12

b).2x²+11x-15
2*1²+11*1-15 = 2*1+11-15 = 2+11-15 = 13 -15 = 12