math
posted by Jane .
Please explain how to set this up and how to solve:
A school's rectangular athletic fields currently have a length of 125 yd and a width of 75 yd. the school plans to expand both the length and the width of the fields by x yards. What polynomial is standard form represents the area of the expanded athletic field?

A = Area
L = Lenght
W = Width
New lenght L = 125 + x
New width W = 75 + x
A = W * L
A = ( 125 + x ) * ( 75 + x )
A = 75 * 125 + 75 * x + x * 125 + x * x
A = 9375 + 75 x + 125 x + x ^ 2
A = x ^ 2 + 200 x + 9375 
(x+125)(x+75) = Area

I loved the way you broke it down and explained it to me in detail. What a great help!