anonymous
  • anonymous
Math help!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
are you familiar with the topics absolute minima/maxima?
anonymous
  • anonymous
Yes
welshfella
  • welshfella
|dw:1436463832128:dw|

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anonymous
  • anonymous
What does that mean?
welshfella
  • welshfella
thats the set up find an expression for the area of the rectangle in term of x and y then convert it to one variable so you can find the derivative and equate this to zero.
welshfella
  • welshfella
the curve is that of y = 3 - x^2
anonymous
  • anonymous
So I derive this?
welshfella
  • welshfella
Area of the rectangle A = 2xy and we know that y = 3 - x^2 so plug this expression for y into the expression for the area to get the area in terms of x then find dA/dx and equate to 0 and solve for x to find maxm required
anonymous
  • anonymous
* sorry to interfere but quick ques. why is are 2xy? I thought its only xy? thanks!
anonymous
  • anonymous
a=6x-2x^3?
welshfella
  • welshfella
|dw:1436464453414:dw|
welshfella
  • welshfella
yes thats correct for the area
anonymous
  • anonymous
a*x*y is only half the area of the whole thing?
welshfella
  • welshfella
|dw:1436464614470:dw|
welshfella
  • welshfella
xy is the area of half the box
welshfella
  • welshfella
agreed?
welshfella
  • welshfella
- though i got the x and y wrong way round
welshfella
  • welshfella
|dw:1436464860013:dw|
welshfella
  • welshfella
A = 6x - 2x^3 dA/dx = 6 - 6x^2 = 0 x^2 = 1 x = 1
welshfella
  • welshfella
oh - talking to myself again!!
anonymous
  • anonymous
Sorry I lost internet connection yesterday but thank you so much! @welshfella

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