Show the condition for the function, $\text{'}$F$\text{'}$Open paren. $\text{'}$X$\text{'}$ sub $1$ comma $\text{'}$X$\text{'}$ sub $2$ Close paren. equals Open paren. $2\text{'}$X$\text{'}$ sub $1$ plus $2\text{'}$X$\text{'}$ sub $2$ Close paren. squaredf$($x$1,$x$2)=(2$x$1+2$x$2)2$f$\backslash$mleft$($x$\_1,$x$\_2\backslash$mright$)=\backslash$left$(2$x$\_1+2$x$\_2\backslash$right$)^2,$ to be convex $($also sometimes called "concave up$").$ Please give d$^2$ f