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 JD repainting walls

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6y2−36 =0, 2.5x2= 40, (x+3)2=81 (ignore this part)

 

 

JD is repainting some of the walls in the classrooms at Golder. One wall has a width that is 4 feet less than its length. The wall has an area of 140 square feet. What is the length of the wall?

 Apr 8, 2021
edited by nowlookatthis13  Apr 8, 2021
edited by nowlookatthis13  Apr 8, 2021

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 #1
avatar+128407 
+2

W  =  L  - 4

 

Area  =  L * W

 

140  =  L *  ( L - 4)

 

140  = L^2   - 4L              rearrange  as

 

L^2 -  4L  -  140  =   0          factor as

 

(L - 14)  ( L + 10)  = 0

 

The  first  factor set   =  0   gives us what we  want

 

L  - 14  =  0

 

L  =  14  (ft)

 

cool cool cool

 Apr 8, 2021

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