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anonymous
 one year ago
Math help!
anonymous
 one year ago
Math help!

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0are you familiar with the topics absolute minima/maxima?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dw:1436463832128:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What does that mean?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1thats 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
 one year ago
Best ResponseYou've already chosen the best response.1the curve is that of y = 3  x^2

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1Area 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
 one year ago
Best ResponseYou've already chosen the best response.0* sorry to interfere but quick ques. why is are 2xy? I thought its only xy? thanks!

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dw:1436464453414:dw

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1yes thats correct for the area

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0a*x*y is only half the area of the whole thing?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dw:1436464614470:dw

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1xy is the area of half the box

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1 though i got the x and y wrong way round

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dw:1436464860013:dw

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1A = 6x  2x^3 dA/dx = 6  6x^2 = 0 x^2 = 1 x = 1

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1oh  talking to myself again!!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sorry I lost internet connection yesterday but thank you so much! @welshfella
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