Question

sa se rezolve ecuatia f(f(x))=0, stiind ca f:R->R,f(x)= -3x+2.

Answer 1

f(f(x)) = -3(-3x + 2) + 2 = 9x - 6 + 2 = 9x - 4 => 9x - 4 = 0 x = 4/9

Answer 2

f(f(x))=0

-3f(x)+2=0

f(x) =2/3

-3x+2=2/3

-3x=2/3-2=-4/3

3x=4/3

x=4/9

verificare f(4/9)=-4/3+2=2/3

f(2/3)=-2+2=0

adevarat, bine rezolvat