C3 Last Minute Questions Thread (Edexcel 1 day to go!)

Probably really simple but slightly confused what they've done here! (This is Q5 from June 2017):

I understand it all apart from how they managed to get 3x+10 on the top? When I work it out I get x = ln(10/(3x+1)) so basically missing that 3x on the top!

Any help appreciated, thanks!

Probably really simple but slightly confused what they've done here! (This is Q5 from June 2017):

I understand it all apart from how they managed to get 3x+10 on the top? When I work it out I get x = ln(10/(3x+1)) so basically missing that 3x on the top!

Any help appreciated, thanks!

Rewrite $1 = \dfrac{3x+1}{3x+1}$

How do I remember how to draaw sine inverse and cos inverse? and tan inverse? I know its too late to ask but can ya help a brother out

Does anyone know how to find the range of g(X) when g(X)=x/(x-3) and x>3. It's only 2 marks and the mark scheme doesn't show any working. Thanks

This is an improper fraction so you can split it using a division method e.g. long division. If you do that you get

$1+\frac{3}{x-3}$

Does that help?

I think c3 has been leaked someone report to edexcel

is the domain the output of the function and the range is the input? Or is it the other way round? I can never do domain and range ughh

domain = input (x values)

range = output (y values)

Weird but how I remember it is you hit golf balls into the driving 'range' so this is the output and then input x values to get y values so match them up accordingly. Hope this makes sense.

okay thank youu! Good luck with C3

How do you differentiate y=x^2 lnx / 3 -2x+4
I am having trouble doing x^2lnx/3

For $\frac{x^2\ln x}{3}$ first take out the $\frac{1}{3}$ so you just have to differentiate $x^2\ln x$. Now try to use the product rule for $x^2$ and $\ln x$. Post your working if you get stuck.