C3 may2012 preparation.

[Youssef Ali Mohammed]

Okay, so f(x) = 1 + (2/x+1)

The +1 is a vertical translation, and you already know the shape of the curve 1/x, in that regard, (x+1) is a horizontal translation of -1. And the factor 2, is a stretch.

As for the range, 2/(x+1) will never be zero, so think about where the curve tends to as x tends to positive and negative infinity.
The domain, X belongs to the reals, but can't be equal to -1.

The easiest way to determine these is to look at the graph

Is it possible for someone to draw it ? even if its not that accurate..

 

[Youssef Ali Mohammed]

Why isnt anyone revising anything over here ? XD

 

[xIshtar]

Why isnt anyone revising anything over here ? XD

I've been studying myself
Could you give me a year?

 

[Youssef Ali Mohammed]

I've been studying myself
Could you give me a year?

June 06 number 4 D.

 

[Youssef Ali Mohammed]

Anyone??

 

[Youssef Ali Mohammed]

étudiante can you help out plsss?

 

[étudiante]

étudiante can you help out plsss?

I hope so, if i havent forgotten C3

But feel free to ask

 

[Youssef Ali Mohammed]

I hope so, if i havent forgotten C3

But feel free to ask

June 2006 Q.4d

 

[étudiante]

June 2006 Q.4d

I think he'll be able to help better Evolution

 

[Evolution]

oww sure, I didn't see this message, hold on a sec.

 

[Youssef Ali Mohammed]

can i get an answer anytime soon? gtg to sleep :/

 

[étudiante]

can i get an answer anytime soon? gtg to sleep :/

m sorry but i seriously have forgotten C3 since last year (i gave it last june, just hang on a sec n m sure he'll get it )

 

[Youssef Ali Mohammed]

how much did u get?

 

[étudiante]

how much did u get?

A, 94
but this year i only had mechanics so i've SO forgotten this stuff .... sorry

 

[Evolution]

Hi every1
Basically I`m stuck with question 1 on jan 2012

hey guys for the same question, part a, it seems easy, but I get dy/dx= 2x[ln(3x)] + x/3
the answer is 2x[ln(3x)] + x.

 

[Youssef Ali Mohammed]

hey guys for the same question, part a, it seems easy, but I get dy/dx= 2x[ln(3x)] + x/3
the answer is 2x[ln(3x)] + x.

you must have diffrentiated ln3x to be 1/3x instead of 3/3x
Diff. of Ln(F(x)) = f`(x)/f(x)

 

[Youssef Ali Mohammed]

A, 94
but this year i only had mechanics so i've SO forgotten this stuff .... sorry

wow mashallah! 94% i would love to get that grade pray for us

 

[étudiante]

wow mashallah! 94% i would love to get that grade pray for us

Thanks so much Inshallah u will too dw ^_^ n sure, u do too

 

[Youssef Ali Mohammed]

Evolution did u get the answer or june 06 no 4d yet?

 

[Evolution]

youssef are u serious? that question is the easiest question in the paper.
Listen whenever u see a question that has ln or e: then u must know immediatly that these values can be equal to 0 when they are minimum.
In this case, as t progress to infinity, in other words as time becomes really large e^-0.05t becomes zero. Try it get ur calculator and put e^-.052(1x10^66) or something,
Since that is zero, then the only part of the equation left is the +25. So the temp can never go below 25. therefore it never reaches 20.