The Student Room Group

C3 functions

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Reply 20
Original post by Zacken
You should practice your graph-sketching skills then, simple ones like these shouldn't be taking "too long", once you have some intuition and understanding down, then you can stop drawing graphs everytime you have one of these questions, for now - draw the graphs, seriously.


ah ok

what's the difference between

1x+1\dfrac{1}{x+1}

and

1x+1\dfrac{1}{x} +1
Reply 21
Original post by bigdonger
ah ok

what's the difference between

1x+1\dfrac{1}{x+1}

and

1x+1\dfrac{1}{x} +1


The obvious one, they're two different expressions. It's like asking what's the difference between 11+1=12\frac{1}{1 +1} = \frac{1}{2} and 11+1=2\frac{1}{1} + 1 = 2, they're two different numbers.
Reply 22
Original post by Zacken
The obvious one, they're two different expressions. It's like asking what's the difference between 11+1=12\frac{1}{1 +1} = \frac{1}{2} and 11+1=2\frac{1}{1} + 1 = 2, they're two different numbers.


so the one of the top moves the graph left by 1 unit and the other one moves the graph up by 1 unit?
Reply 23
Original post by bigdonger
so the one of the top moves the graph left by 1 unit and the other one moves the graph up by 1 unit?


The graph of what?
Original post by Zacken
The graph of what?


The graph of y=1/x clearly.

Original post by bigdonger
so the one of the top moves the graph left by 1 unit and the other one moves the graph up by 1 unit?


Yes, that is correct.
Reply 25
Original post by Zacken
The graph of what?

of y=1xy=\frac{1}{x}
Original post by HapaxOromenon3
The graph of y=1/x clearly.



Yes, that is correct.


^^what this guy said
Reply 26
Original post by bigdonger
of y=1xy=\frac{1}{x}


Yes, but it's important that you always mention what graph you're transforming.
Reply 27
Original post by Zacken
Yes, but it's important that you always mention what graph you're transforming.


Ah ok :smile:
Got it.

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