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nickersia
 one year ago
Tangent at the point of inflection question.
nickersia
 one year ago
Tangent at the point of inflection question.

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nickersia
 one year ago
Best ResponseYou've already chosen the best response.0Part d, help anyone? Thanks :)

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1Would you please start the necessary work, and share with us what you have done. also, please explain what it is that you need to know. Let's build upon what you do already know.

nickersia
 one year ago
Best ResponseYou've already chosen the best response.0Everything is on the picture, I've done parts a,b and c, and I don't know how to do part d

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1Your work is very neat. I apologize for not having scrolled down to see what you'd already done. Let me look at Part D. What do you think you need to know to answer Part D correctly?

nickersia
 one year ago
Best ResponseYou've already chosen the best response.0\[yy _{1}=m(xx _{1})\] \[y (\frac{ 2 }{ 4 }1+\ln \frac{ 2 }{ 4 }) = \frac{ x _{a} 2}{ x _{a} ^{2} }(x4)\] where Xa is 4 because point B is (4,0.193)

nickersia
 one year ago
Best ResponseYou've already chosen the best response.0y1 (this thing in the bracket) is equal to 0.193 which I got as a coordinate for B, and the slope of the tangent should be equal to derivative of y at point B

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1I'm going to assume that your point of inflection, (4,0.193), is correct. then \[x _{0}=4,y _{0}=0.193\] and you need only substitute these into the pointslope formula for the equation of a straight line. What is your assumed value for the slope, m?

nickersia
 one year ago
Best ResponseYou've already chosen the best response.0\[m = \frac{ x2 }{ x ^{2} }\] where x is 4, so it gives me 0.125

nickersia
 one year ago
Best ResponseYou've already chosen the best response.0Because \[\frac{ dy }{ dx } = m\]

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1Using your formula for the slope, and calculating the slope that way, I get the same result calculating the slope differently. I, too, get m=0.125, which is the same as 1/8. I'd suggest you substitute these numerical results into the point slope form. Point of tangency is (4,0.193), as before, and slope is either 1/8 or 0.125.

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1\[y0.193 = (?)*(x  ?)\]

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.0the second derivative must equal zero to be an inflection point

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1@nincompoop, are you saying that the inflection point is not (4,0.193)?

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.0I didn't look at his solution, but that is what to bear in mind when looking for the inflection point.

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1@nincompoop: If you haven't looked at Nick's solution, then commenting as you have is irrelevant and distracting. If you had found a mistake, then I would have wanted to hear from you.

nickersia
 one year ago
Best ResponseYou've already chosen the best response.0\[y  (\frac{ 1 }{2 }+\ln2) = \frac{ 1 }{ 8 }(x4)\] . . . \[x8y+8(\ln21)=0\] The problem was that I didn't changed the slope with 1/8 at the beginning so it got more and unnecessary complicated.

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1@nickersia: Congrats! Again, I admire the neatness and precision of your work.

nickersia
 one year ago
Best ResponseYou've already chosen the best response.0@nincompoop yes, I used that in part b) Thank you @mathmale ! :)

mathmale
 one year ago
Best ResponseYou've already chosen the best response.1Thanks for the medal and for becoming a fan of mine! Hope to work with you again soon.

nickersia
 one year ago
Best ResponseYou've already chosen the best response.0You're welcome, me too! Good luck :)
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