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Filling a trough

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Filling a trough

Postby nurzhan » Sat Jan 21, 2012 11:27 pm

Hi! I'm Nurzhan. In the 2nd example of related rates topic close to the end of the video you made a correction saying that you'd forgotten that "h=3". Don't you need to review from the step 2 taking into account that the vaue of "h" is known aready? I'm just stuck here.

Thanks,
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Re: Filling a trough

Postby mike » Mon Jan 23, 2012 8:29 am

Good Question!

In steps 1. and 2. we are doing things in general, which means that no matter what value we put in for h our work will still be correct. So once we do all the general work at the very end we plug in our value for h to find a specific answer.

Let me know if you have more questions of if this explanation doesn't really help you.

Mike
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