can you explain why? and also use their definitnons $to$ show why?

Which of these is true, for functions:

f$($n$)=($n $+$ n$^2)*($log n$)$

g$($n$)=$ n$^2($log n $+$ n$^0\mathrm{.}5)$

f$($n$)=$ o$($g$($n$))$

f$($n$)=($g$($n$))$

f$($n$)=($g$($n$))$

None of these is true