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

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:
�..
�..
�..

RELATED QUESTIONS
A rectangular goat pen has an area of 220 square meters. Its perimeter is 62 meters. What (answered by solver91311)

A rectangular goat pen has a perimeter of 24 meters and an area of 32 square meters. What (answered by ikleyn,stanbon)

A dog pen mearures 4 meters wide adn has an anrea of 20 square meters. What is the... (answered by ewatrrr)

Oliver is building a rectangular dog pen with an area of 18.9 square feet. If the... (answered by Fombitz)

A rectangular animal pen is built using 200 meters of fencing. If one side of the... (answered by macston)

A rectangular animal pen will be built using 200 meters of fencing. If one side of the... (answered by knighty2002uk)

A holding pen for cattle must be square and have a diagonal length of 140 meters A.... (answered by Alan3354,robertb)

A holding pen for cattle must be square and have a diagonal length of 140 meters. Find (answered by mananth,robertb)

suppose you have 20 meters of fencing for making a rectangular dog pen. what is the... (answered by Fombitz)