SOLUTION: I have a rectangular pen with an area of 2400 square meters. I remember that the width of the pen is 20 meters greater than the length. Find the length and width of the rectangular

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Question 111796: I have a rectangular pen with an area of 2400 square meters. I remember that the width of the pen is 20 meters greater than the length. Find the length and width of the rectangular pen. I used the formula Let w = the width; Let w + 3 = the length; Area = lw and the instructor said that it was not a proper function because it only contained one variable. What am I doing wrong?

Answer by MathLover1(20849) (Show Source):
You can put this solution on YOUR website!
if the width of the pen is 20 meters greater than the length, you can't have w + 3 = the length;
you need to write:
the of the pen is greater than the �....=>

�..substitute and

��move to the right
��
Use quadratic formula to find only positive value for the length

��.the length
Now find the width

Check:
�..
�..
�..