math1001: differential calculus (1 Viewer)

[Carlito]

Originally posted by Winston
hmmm this is strange Wyvern, im getting like -5 for a^2 when z = 3 and -20 for b^2 :S

i got z=3 is undefined ?

 

[Wyvern]

yes z=3 is undefined..........its out of range so you dont have to do anything for z=3

 

[Wyvern]

what does a ellipse look like 2d?

 

[Winston]

ahh so getting negative roots is correct?

and one more thing for question 2 ii, is it true we have one horizontal inflexion points at x = 0 and two minimum turning point at x = 5 and 2?

 

[Wyvern]

yeah its correct.....you dont have to draw anything for z=3..........just write its out of range

 

[Winston]

when z = 1 is it right to have a = +/- root 3 and b = +/- 2 root 3?

 

[Wyvern]

yeah

 

[Winston]

Originally posted by Wyvern
yeah

if it's positive negative, do we only take into acount the positive?

 

[Wyvern]

it just means the ellipse goes +root 3 to the right and -root3 to the left from the center

 

[Winston]

hmmm but strangely for z = 2 a = 0 b = 0 there's nothing to plot :S

 

[famunlau]

Originally posted by Winston
hmmm but strangely for z = 2 a = 0 b = 0 there's nothing to plot :S

its a pt at z = 2....at the pt where x = 1 and y =3....

 

[Winston]

Originally posted by famunlau
its a pt at z = 2....at the pt where x = 1 and y =3....

therefore its something soooo minuute its hard to see...

 

[famunlau]

therefore it is the apex of the solid
and if u really want help...go ask tooheyz ....at uni...easier that way

 

[Winston]

so has anyone figured out how to do these ones


question 1a part (iii) question 1b part (iii) question 2(a) (i) and (iii)

and question 2(b)

 

[Wyvern]

winston do you know how to do 1) a) ii)?

 

[Winston]

Originally posted by Wyvern
winston do you know how to do 1) a) ii)?

i just sketched it in a xyz plane

and described it, basically saying it ina sentence, what the shape is, and what the co-ordinate is and what the equation is. that should describe it, that's how the book does it in an example.

 

[Carlito]

Originally posted by famunlau
and if u really want help...go ask tooheyz ....at uni...easier that way

but shes so hard to find lol

 

[Winston]

Originally posted by Carlito
but shes so hard to find lol

its like finding bill gates ...

anyways guys i need help on question 2a (i) (iii) and 2b then im done

 

[Carlito]

nice of you to dog our arin lecture today winston

 

[Winston]

Originally posted by Carlito
nice of you to dog our arin lecture today winston

Ahuh ... it was about VR yeah? We did it again in the tut