Question

A white square quilt has a purple square in the center.the side length of the purple square is (x-5) inches and the width of the quilt is 60 inches. What is the area of the white part of the quilt?

Answer 1

Area of quilt, Q= $60^2\, in^2=3600\,in^2$
Area of purple square, P = $(x-5)^2\, in^2$
Area of white area 
= Q-P
= $3600-(x-5)^2\, in^2$
=$3600-x^2+10x-25\, in^2$
=$3575-x^2+10x\, in^2$