Answer : 18J

Displacement $S=r_2-r_1$

$\qquad\qquad\quad\;\;=(\hat{i}+3\hat{j})-(4\hat{i}-5\hat{j})$

$\qquad\qquad\quad\;\;=-3\hat{i}+8\hat{j}$

$W=F.S$

$\;\;\;\;=(2\hat{i}+3\hat{j}).(-3\hat{i}+8\hat{j})$

$\hat i.\hat i=\hat j.\hat j=1$ and $\hat i.\hat j=0$

$\;\;\;\;=-6+24$

$\;\;\;\;\;=18$J