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Urgent math help

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Mr_Orange
Posts: 1024 - Karma: 154
this is due in an hour.... theres 2 questions I don't get


(c) A rectangle has its base lying on the x− axis and its upper corners on the parabola y=18−x2. If the upper right corner is (sClick for larger imaget), express the area A of the rectangle as a function of s.

Answer: The area of the rectangle is A=

AND...

(1 pt) For the function f(x)=x2+5x, simplify each expression as much as possible.

(f(w)-f(x)) / w-x =

(NOTE: x=/=w






Jan 25 2011 12:52AM
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Arabian.
Posts: 9642 - Karma: 156
I don't remember this at all.

I can tell you that the extra credit is sqrt(f(x) -5x)) = x

I do not, however, wish to look up the equation for solving the rectangle problem. I'm sure it's in your book and it's easier than it seems.
Jan 25 2011 1:00AM
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Mr_Orange
Posts: 1024 - Karma: 154
i'll try your answer if I cant figure it out and run out of time thanks...

can anyone find the domain of sqrt((3)((x-8)/x)+2) ???
Jan 25 2011 1:12AM
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