Question

fie fct f : (0, ∞) → R, f(x) = $log_{3} x$ Calculati f(1) + f(9) - f(3)

Answer 1

f(1)=log(3)1=0
f(9)=log(3)9=log(3)3^2=2
f(3)=log(3)3=1
inlocuiesti
f(1)+f(9)-f(3)=0+2-1=1

Answer 2

$log_{3}1=0; log_{3}9=2; log_{3}3=1 \\ f(1)+f(9)-f(3)=0+2-1=1$