+33661 "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!
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+502 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
+33661 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?
+502 I understood how u did but i cant confirm ur answer with the answer of the answer sheet
