- #1
IbrahimA
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Homework Statement
A piece of wire, 100 cm long, needs to be bent to form a rectangle. Determine the dimensions of a rectangle with the maximum area.
Homework Equations
P = 2(l+w)
A = lw
The Attempt at a Solution
This is what I don't understand, the solutions that I saw from looking around is:
l = x
w = (100 -2x) / 2
I don't understand why is width portrayed as shown above, and why the length is also potrayed as above, the solution goes onto:
A = (x)(100 - 2x / 2)
A = (x)(50 = x)
A = 50x - x^2
A prime = 50 - x^2
Insert 0 for A prime
0 = 50 - x^2
x=25
With therefore means the length and width are 25cm.
I understand the algebra, I do not understand how to get the length and width equation, wondering if someone could explain it to me.