SOLUTION: An envelope is 4 cm longer than it is wide. The area is 60 cm^2. Find the length and width.

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Question 910767: An envelope is 4 cm longer than it is wide. The area is 60 cm^2. Find the length and width.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

     .

A = Lw

(w+4)w = 60cm^2

w^2 + 4w - 60 = 0 (Tossing out the negative solution for unit measure)

(w +10)(w-6) = 0

w = 6cm  and L = 10cm 6%2B4

And...checking

A = 60cm^2

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