Maximize f$($x$)=2$x$1$x$2+$x$2-$x$3-2$x$2$Find near$-$optimal solution using backtracking line search starting from initial solution$($x$1,$ x$2)=(1,1)$ and $=0\mathrm{.}25,$ t $=1,$ a $=0\mathrm{.}5,$ B $=0\mathrm{.}8.$ Show me the calculation process step by step plz$.$