Answer:
-20
Step-by-step explanation:
[tex] {x}^{2} - {y}^{2} = (x + y)(x - y) = 65[/tex]
however,
[tex]x - y = - 13[/tex]
therefore;
[tex](x + y)( - 13) = 65[/tex]
[tex](x + y) = - 5[/tex]
[tex]4(x + y) = 4 \times ( - 5)[/tex]
[tex]2(2x + 2y) = - 20[/tex]
