Arectangular playground covers 4500 m2 it's length is 40m longer than it's width

I think this is the answer

To find the area of a rectangle, it is l×w=A
We can use bits of information to fill in the variables.
The playground covers 4500 m². A=4500
l×w=4500
The length is 40 m longer than the width.
L=W+40
w(w+40)=4500
Let's multiply.
W²+40w=4500
I solved this by making a graph and finding when the two sides intersect (as shown in the picture below).
So since the width is 50, that means the length is 90.

Ithink it would be 1.24 pounds