[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !

[leebux101]

yeah ok thanks alot, the earlier attachment that u posted, thats also right,  ryt?

[leebux101]

also can u please do ON2010 Q1 from P32! please! please please!
ur a life saver!

[........]

I just showed how to find the modulas of the least argument .

[SkyPilotage]

also can u please do ON2010 Q1 from P32! please! please please!
ur a life saver!

Just square both sides..

[SkyPilotage]

This was the second part.

Actually you solved it correctly the first time...
The least value for modulus of z is where the line from the origin intersets the circle closest to the origin which is somewhere at the centre of the circle.. Check the diagram you drew again.. And isnt the modulus of u is root 2 not 2root2?

[........]

Just square both sides..

and to find the range
just put the values -7 and 1 on a number line

take out any value less than 1 like 0 and put it into (x-1)(x+7)
take out another value between -7 and 1 and put it into ^

and finally a value less than -7 and put it into (x-1)(x+7)

and see if they are less than 0

[leebux101]

yeah what u did earlier was ryt too..
and the answer is the same in the marking scheme


secondly >> i did square the sides! =( but i dont get it,
can u give a step by step description please! please! =(

[leebux101]

and to find the range
just put the values -7 and 1 on a number line

take out any value less than 1 like 0 and put it into (x-1)(x+7)
take out another value between -7 and 1 and put it into ^

and finally a value less than -7 and put it into (x-1)(x+7)

and see if they are less than 0

hey i didnt know we could do that... interesting..

[........]

Actually you solved it correctly the first time...
The least value for modulus of z is where the line from the origin intersets the circle closest to the origin which is somewhere at the centre of the circle.. Check the diagram you drew again.. And isnt the modulus of u is root 2 not 2root2?

dude they're not asking for least value of modulus of z
they're asking for modulus of z when argument of z is least

[SkyPilotage]

dude they're not asking for least value of modulus of z
they're asking for modulus of z when argument of z is least

which question are you on? ahaha

[........]

Hi guys
I really need help with complex numbers and argand diagrams!
Can u plz help me with these qs/

JUNE 10 V1 Q7 Part 3
THANK U

This one
I am getting confused bro..
There were 3 questions that were being asked

[SkyPilotage]

and to find the range
just put the values -7 and 1 on a number line

take out any value less than 1 like 0 and put it into (x-1)(x+7)
take out another value between -7 and 1 and put it into ^

and finally a value less than -7 and put it into (x-1)(x+7)

and see if they are less than 0

Would be easier for you if you say that outside the range, the sign is the same sign as a(coefficient of x^2) so if its <0 then its  -7<x<1 ...
But your way is perfectly correct too...

[SkyPilotage]

This one
I am getting confused bro..
There were 3 questions that were being asked

OH oH my bad!! I thought you were on Nov 2006  9 iii) it has also u and z-u=1 srry

[leebux101]

oh never mind! i thought u were talking about ON 2003 question..
guys please i need this one ON 2010 P32 Q1

[leebux101]

confusion between 3 papers! lol haha! =D