$1.$ If f$($n$)=2$n$2+$n$+10$ and g$($n$)=$n$2,$ please show f$($n$)=\backslash$Theta $($g$($n$)).($Hint: you need to find c$1,$ c$2,$ and no to make c$1$g$($n$)<=$f$($n$)<=$c$2$g$($n$))$