Question 1157356
Width = w
Length = w + 4
<pr>
(w + 5)((w + 4) - 3) = w(w + 4) + 21
<pr>
(w + 5)(w + 1) = w² + 4w + 21
<pr>
w² + 6w + 5 = w² + 4w + 21
<pr>
6w + 5 = 4w + 21
<pr>
2w = 16
<pr>
w = 8
<pr>
Width = w = <b>8</b>
Length = w + 4 = 4 + 8 = <b>12</b>