October 25th, 2016, 03:31 AM  #1 
Newbie Joined: Oct 2016 From: Australia Posts: 2 Thanks: 0  Help with question So I did method 2, but I have no idea what it means for method 1 and 3. Any help would be greatly appreciated, thanks. Last edited by skipjack; October 25th, 2016 at 04:33 AM. 
October 25th, 2016, 04:58 AM  #2 
Newbie Joined: Oct 2016 From: Australia Posts: 2 Thanks: 0 
I don't know how to edit, but I've done method 3; I just don't know what to do for method 1.
Last edited by skipjack; October 25th, 2016 at 05:31 AM. 
October 25th, 2016, 05:32 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 16,781 Thanks: 1237 
For (3), x(5  2x) = 2(5/4)²  2(5/4  x)², so greatest area is 2(5/4)²m², etc.

October 26th, 2016, 12:12 AM  #4 
Senior Member Joined: Apr 2014 From: UK Posts: 713 Thanks: 272 
I make it (5/3)^2

October 26th, 2016, 06:42 AM  #5 
Banned Camp Joined: Jun 2014 From: Earth Posts: 945 Thanks: 191  Do you see that one dimension would be x, and the other dimension would be (5  2x)? The area is x(5  2x). After taking the derivative, setting it equal to 0 and solving for x, and substituting that back into the area expression, please check the area again to see if you come up with skipjack's answer. 

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