Question

Fie f, g:R-->R, f(x)=3x+6
g(x)=4x-8.Rezolvati in R ecuatia (gOf)=-3

Rezolvati inecuatia f(x) supra f(1) mai mic sau egal cu 0


Va rogg ajutor

Answer 1

g(3x+6)=-3
4(3x+6)-8=-3
12x+24-8=-3
12x=-19
x=-(19/12)

(3x+6)/9 <=0 =>3x+6 <= 0
3x<= -6
x<= -2 
x∈(-∞,-2]
<= este mai mic sau egal