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|dw:1433649074172:dw|

Let A = xy
2x + 2y = 1600

why does it became 2x +2y sir?

rectangle with given area but with minimum perimeter:
|dw:1433659554258:dw|

A=xy
since x=y
A=y*y
1600=y^2
y=40=x

how do you know y=x will give maximum?
are you allowed to assume that?

from the perimeter:
2x+2y=P
2(40)+2(40)=P
P=160
therefore P=160 is the answer

the min*

by differentiating you can get y=x

ok your answer seems to be fine as long as you also show in your paper how you came to the y=x part

just see the attached file

and then once I found x from that equation plug into xy=1600 to find y

yeah you can also do that

we came up with the same answer

hmm it looks like he got the area and perimeter mixed up

yep that is exactly what happened

oooh yeah..

ooh thank you for this sir.. it will be a great help for me

ooh thanks

that second equation came from differentiating 500=x+2y

w.r.t. x

anyways neat

oooh yes i got it