We have a square with side y
we are told that ewach side is increase by 5 units
then the new side is
y+5
now, the area pf the square is a^2
thus
[tex]A=(y+5)^2[/tex]Given the following formula
[tex](a+b)^2=(a^2+2ab+b^2)[/tex]Reaplicing for our values
where
a=y
b=5
[tex]A=y^2+2*(y)*(5)+5^2[/tex][tex]A=y2+10y+25[/tex]answer is B
