...Samira's Qs...

[samiira]

Please help me out wiv a few of these MCQ questions.. its on attachment.. thnks heaps..

[Stroodle]

The document comes out all jumbled up when I try to open it

Maybe cause I'm using a mac...

[samiira]

I uploaded it again.. and this time for word or pdf.. which ever opens up for u

[moekamo]

1.




so 3 complex roots, so c. probably didnt need to find the roots, just simplify to get z^3=-4i and you should know that this gives 3 complex roots.


2. by inspection:



so A

3.

this is just a straight line equation:
so has no stationary points or asymptotes, hence C.

4.

put into calc and see imaginary component of the reciprocal is 1/3, so must be A


5.

, so cant be A, we know its not 0 as then it would be the origin, so must be B.

6.

This is perpendicular bisector of origin and
which is equivelant to B

hope this is all right :S

[samiira]

THANK YOU SOOOOO MUCH.....   

[samiira]

for these questions wat we r asked to do is answer which one is right and explain why the others r wrong.. so if u have time or if u can please let me know them for any of the questions.. i am not pushin u .. just incase if u know them and mayb u cud share ur answer.. thnx

[samiira]

Hey moekamo :
i just noticed some problems..
you wrote their  z^3 + 2^2i^2 + 2z^2 + 4i.. How did u get 2^2i^2 + 2z^2 .. because the question said  2iz^2 + 2z

and also in Q3. its not a straight line its x+ (b/x).. so its a straight line added to a hyperbola....

sorry for the trouble

[moekamo]

oops, for the polynomial one, its meant to be
so the z bit that i made a mistake on cancels anyway... to give the same result.

also in q 3, in the pdf its x + x/b, is that a mistake??? if it is then you can exclude C as x cant equal 0, B is correct as there is asymptote at x=0 and at y=x

[samiira]

its meant to be  2iz^2 + 2z
 

[moekamo]

ok, so

so 3 complex roots, so answer is C

[samiira]

Thnks heaps.. sorri for da trouble once again

[samiira]

4  MCQ QUESTIONS.. please refer to attachment

[samiira]

Please some one help me.. these are new questions 

[the.watchman]

Well the first one is:

Dilate by a factor of parallel to the y-axis

So replace with



  (B)

[qshyrn]

i got option C for that its 1/3 dilation from x axis :
x^2 + (y/3)^2=9  expand the y bit and divide all by 9