anonymous
  • anonymous
f(x)=6x^2+5 (f(a+h)-f(a))/h
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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chrisplusian
  • chrisplusian
So in this example f(x)=6x^2+5, if I told you find f(2) would you know what to do?
anonymous
  • anonymous
yes its just plugging it in to the function
chrisplusian
  • chrisplusian
You would plug 2 in everyplace there was an x. In the problem above there is an (a+h) in the argument. So every place you see an x in the original replace it with (a+h). Then the second part shows f(a) so plug a in for every instance of x.

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chrisplusian
  • chrisplusian
Then continue to manipulate algebraically
chrisplusian
  • chrisplusian
\[f(a+h)=6(a+h)^2 +5 =6(a^2 +2ah +h^2)+5\]
chrisplusian
  • chrisplusian
\[6(a^2 +2ah +h^2)+5 = 6a^2 +12ah +6h^2 +5\]
anonymous
  • anonymous
and then subtract that from 6a^2+5?
chrisplusian
  • chrisplusian
yes :)
anonymous
  • anonymous
so i got 12ah+6h^2+10
anonymous
  • anonymous
so divide by h?
chrisplusian
  • chrisplusian
\[\frac{ 6a^2 +12ah +6h+5-(6a^2 +5) }{ h }\]
chrisplusian
  • chrisplusian
\[\frac{ 12ah +6h }{ h }=\frac{ h(12a+6) }{ h }=12a+6\]
chrisplusian
  • chrisplusian
Hope that helps
anonymous
  • anonymous
im sorry but it says its wrong
chrisplusian
  • chrisplusian
I see my mistake.... look up at the equation I posted just after you said "So divide by h?". In that equation I had 6h in the numerator. it should have been 6h^2. Then you would have had 12a+6h as an answer sorry about that
anonymous
  • anonymous
ohhhh okay got it, thanks!
chrisplusian
  • chrisplusian
Your welcome
anonymous
  • anonymous
It should only be \(\huge 12a\).
anonymous
  • anonymous
You're finding the derivative, right?
anonymous
  • anonymous
no his answer was right
anonymous
  • anonymous
Ok if that's what you're saying.
chrisplusian
  • chrisplusian
@Maharot there is one thing missing for it to be a derivative. This was an example of the "difference of a quotient" function which represents the slope of a line secant to two points on a curve. If you wanted a derivative you are asking for the slope of that same curve but at any point. In order to do that you need to consider the "h" in the above problem as a change in the x direction and then take the limit as delta x approaches infinity. That is to say that the two points on the curve are the same and the slope represented is at a point rather than in between two points

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