Question

Se considera functia f:R-r f(x) = -3x+9 b)Rezolavati inecuatia f(x) +F(1)>_ f(2x+1)

Answer 1

f:R->R
f(x)= -3x+9
f(x)+f(1)>_f(2x+1)?
f(1)= -3×1+9= -3+9=6
f(2x+1)= -3(2x+1)+9=-6x-3+9= -6x+6
f(x)+f(1)>_f(2x+1)
=>-3x+9+6>_-6x+6
-3x+6x>_-9-6+6
3x>_-9
X>_-9/3
X>_-3
=> X € [-3; +infinit)