+0  
 
+1
71
7
avatar+399 

Differentiate 

5x - 7 + 2x-1/2 + 3x-1

Rauhan  Nov 25, 2017
Sort: 

7+0 Answers

 #1
avatar+26366 
+3

"Differentiate 5x - 7 + 2x-1/2 + 3x-1"

 

\(\frac{d}{dx}5x=5\\\frac{d}{dx}7=0\\\frac{d}{dx}2x^{-1/2}\rightarrow (-1/2)2x^{-1/2-1}\rightarrow -x^{-3/2}\\ \frac{d}{dx}3x^{-1}\rightarrow (-1)3x^{-1-1}\rightarrow -3x^{-2}\\\)

 

I'll leave you to add these together!

.

Alan  Nov 25, 2017
 #2
avatar+399 
+2

I am confused at what the answer sheet says

http://egyptigstudentroom.com/pastpapers/edexcel/alevel/gce/Math/Jan%202008/ms//8371_9374_GCE_Mathematics_msc_20080306_UA019869.pdf go to page number 9

Rauhan  Nov 25, 2017
 #3
avatar+26366 
+2

I’m not surprised - it is the muddiest explanation I’ve ever come across!

 

Do you understand the derivatives in my previous reply, or do you need more explanation?

Alan  Nov 25, 2017
 #4
avatar+399 
+2

I understood how u did but i cant confirm ur answer with the answer of the answer sheet

Rauhan  Nov 25, 2017
 #5
avatar+26366 
+2

The answer sheet has the results as indicated by the red boxes below (you still need to add them together):

 

.

Alan  Nov 25, 2017
 #6
avatar+399 
+3

So the answer is 5 - x-3/2 - 3x-2

Rauhan  Nov 25, 2017
 #7
avatar+26366 
+3

Correct!

Alan  Nov 25, 2017

3 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details