the length of a rectangle 1ft less than double the width ,and the area of the rectangle is 21ft^2 find the dimensions

Question

need help finding the actual width and lrngth

Answer 1

L=length

W=width

 

L=2W-1

 

L(W)=Area

(2W-1)W=21
2W^2-W-21=0

(2W-7)(W+3)+0

 

Dimensions cannot be negative so W=7/2 

L=2(7/2)-1=6