My Math Forum Calculus New problem

 Calculus Calculus Math Forum

 September 3rd, 2012, 06:20 PM #1 Senior Member   Joined: Aug 2012 From: South Carolina Posts: 866 Thanks: 0 Calculus New problem y=f(x) = root x (a) f(x+changeinx)
 September 3rd, 2012, 06:31 PM #2 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 461 Math Focus: Calculus/ODEs Re: Calculus New problem $f$$x+\Delta x$$=\sqrt{x+\Delta x}$ Is that what you mean? I assume you are to continue and find the derivative of f(x) with respect to x using first principles?
 September 3rd, 2012, 06:48 PM #3 Senior Member   Joined: Aug 2012 From: South Carolina Posts: 866 Thanks: 0 Re: Calculus New problem yes Mark I am sure that is right. just need to work through enough problems till it starts making more sense I did however think the answer was rootx + change root x written rootx + the triangle symbol (delta I think) root x explain to me why final answer = root xchangex
 September 3rd, 2012, 06:59 PM #4 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 461 Math Focus: Calculus/ODEs Re: Calculus New problem We simply take $x$ and replace it with $x+\Delta x$. Using the given function definition, we have $f$$\text{something}$$=\sqrt{\text{something}}$.
 September 3rd, 2012, 07:47 PM #5 Senior Member   Joined: Aug 2012 From: South Carolina Posts: 866 Thanks: 0 Re: Calculus New problem now I see Mark I was blind but now I see!!! anyway, I also see why the instructor says (EASY) in parenthisis lol
 September 4th, 2012, 10:58 AM #6 Math Team   Joined: Sep 2007 Posts: 2,409 Thanks: 5 Re: Calculus New problem Don't you hate it when instructors do that?
 September 5th, 2012, 09:19 AM #7 Senior Member   Joined: Aug 2012 From: South Carolina Posts: 866 Thanks: 0 Re: Calculus New problem What I hate much more is when they get up there and smack away superfast on the blackboard and then get all into their problem, while the class is dumbfounded and never to very well in explaining it. I have another teacher who I had for Statistics last Sem. She is such a good instructor and breaks down whatever she is teaching into steps. On the flip you get some mathematician who should be in industry, yet is in education and not if but when a student gets stumped, they simply act/say "well why are you stumped"? you should know this? and stuff like that. Translation = Not to be redundant but one who should be in industry and NOT education.

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