Question 863121
rectangle, x for length, y for width.
x=y+2
and area is {{{xy=(y+2)y}}}


Double the length and width, and each is 2x and 2y.  This means they are 2(y+2) and 2y.
This area is {{{2(y+2)*2y=4y^2+8y}}}.


Area became increased by 72 square units.
{{{4y^2+8y-(y(y+2))=72}}}
You take the rest of this.