anonymous
  • anonymous
A rectangular pen is to be built against a wall using 60 m of fencing for the three sides which need fencing. If the area of the pen is to be as large as possible, find the length of the longest side and also its maximum area.
Mathematics
chestercat
  • chestercat
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jameshorton
  • jameshorton
450 sq.m
anonymous
  • anonymous
I agree with @jameshorton @Devanshi
anonymous
  • anonymous
How?

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jameshorton
  • jameshorton
a = xy y + 2x = 60 y = 60 - 2x --- a = x(60 - 2x) a = 60x - 2xx --- -2xx + 60x = 0 --- the above quadratic equation is in standard form, with a=-2, b=60 and c=0 --- to solve the quadratic equation, by using the quadratic formula, copy and paste this: -2 60 0 into this solver: https://sooeet.com/math/quadratic-equation-solver.php --- the quadratic has two real roots at: --- x = 0 x = 30 --- the quadratic has a vertex maximum at: ( 15, 450 ) --- maximum area (a) occurs when x = 15: y = 60 - 2*15 y = 30 m --- answer: x = 15 m y = 30 m max area = 450 sq.m ---
jameshorton
  • jameshorton
what grade are u in
anonymous
  • anonymous
Who me or @Devanshi
jameshorton
  • jameshorton
both of ya
anonymous
  • anonymous
I am doing my A levels
jameshorton
  • jameshorton
oh
anonymous
  • anonymous
and you
jameshorton
  • jameshorton
6th
anonymous
  • anonymous
Really You are pretty smart
jameshorton
  • jameshorton
yea my mom teach me and my mom is a docter
anonymous
  • anonymous
Ok
anonymous
  • anonymous
How is this the standard form of equation? @lauren.ascough
jameshorton
  • jameshorton
jameshorton
  • jameshorton
anonymous
  • anonymous
So you just copy pasted the answer @jameshorton ?
jameshorton
  • jameshorton
no why
anonymous
  • anonymous
http://www.algebra.com/algebra/homework/coordinate/word/Linear_Equations_And_Systems_Word_Problems.faq.question.937287.html @jameshorton :)
jameshorton
  • jameshorton
what
anonymous
  • anonymous
@jameshorton did you just copy that ???
jameshorton
  • jameshorton
no
anonymous
  • anonymous
But it is the same
jameshorton
  • jameshorton
i know
anonymous
  • anonymous
James are you lieing
jameshorton
  • jameshorton
no
anonymous
  • anonymous
Just explain the standard equation? @jameshorton ?
anonymous
  • anonymous
it even has the same web address james we know you took it from there just tell us the truth
anonymous
  • anonymous
@jameshorton come on tell us the truth
jameshorton
  • jameshorton
u want the fing truth no i didnt copy it and my real name is not jameshorton
jameshorton
  • jameshorton
i used my dad name to create that site that is my site
anonymous
  • anonymous
lol
jameshorton
  • jameshorton
my real name is jacob
jameshorton
  • jameshorton
jacob lamb

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