E = (3t + 4)(5t-2)-(20t - 12) F = 4-3t(2 - 5t) Démontrer que E = F. Merci de votre aide.

E= (3t+4)(5t-2)-(20t-12)

=15t²-6t+20t-8-20t+12

=15t²-6t+4

F=4-3t(2-5t)

=4-6t+15t²

Donc F=E

E=(3t+4)(5t-2)-20t+12=15t^2-6t+20t-8-20t+12=15t^2-6t+4

F=4-3t(2-5t)=4-6t+15t^2

^2= au carré

E=F=4-6t+15t^2