marginal profit for sales... totally lost it at the p'..

pic included...

Question

marginal profit for sales... totally lost it at the p'..

pic included...

anonymous · Answer

i am taking applied calculus on my one.. so i only have videos to watch. this is a screenshot of the video showing how to solve the problem as this is how i take my notes to get going. Guy did the p'/ deriv equation and just started answering the questions...

I got lost at the 

1024$$\frac{ 1024 }{ x(1/2)}+ \frac{ 1 }{4x ^{3} }$$


at first i was plugging the part A which is 150 into each X spot, but i got no where near his answer. what am i doing wrong???

anonymous · Answer

heh webassign

anonymous · Answer

His answer is completely fine! http://www.wolframalpha.com/input/?i=1024%2Fsqrt%28150%29%2B1%2F%284%28150%29%5E3%29

anonymous · Answer

Are you sure you plugged in correctly? that should be $\sqrt{x}$ not $x(1/2)$ in that denominator, by the way.

anonymous · Answer

let me recalc

anonymous · Answer

whew, after an hour of scratching my head i can finally do a sigh of relief. Its all in how you put it in the calc... Thanks oldrin

anonymous · Answer

No problem @jaytina! Make sure you correctly group expressions. Do you understand the section intuitively?

anonymous · Answer

for this section i am getting by for the most part. these vids and THIS SITE is definitely helping.