the outside of a picture frame has a length which is 4 cm more than width. The area enclosed by the outside of the picture frame is 165 square cm. Find the width of the outside of the picture frame.

1 answer

L = w + 4

L w = 165

(w+4)w = 165

w^2 + 4 w - 165 = 0

(w+15)(w-11) = 0

w = 11