Maths Help

• Forbiddensinner

  27 Oct 09, 19:18

  Need help again : (

  Anyone has any idea why is [5(x-2)] / [3(cuberootx)] < 0 for all x<0 ?

   Thanks in advance as usual. 

• Æ’lame

  27 Oct 09, 19:20

  is the question : 5(x-2) / 3x^3 < 0x < 0

• Forbiddensinner

  27 Oct 09, 19:22

  Originally posted by ƒlame:

  is the question : 5(x-2) / 3x^3 < 0x < 0

  No. I am suppose to sketch the above out. 

  I have no idea why is it <0 for all x<0 though.

• dkcx

  27 Oct 09, 19:30

  x<0 cannot cube root what unless using all the advance maths stuff which i hate.

• deepak.c

  27 Oct 09, 19:33

   

  Got real and imaginary.

   

   

• Forbiddensinner

  27 Oct 09, 19:34

  Originally posted by dkcx:

  x<0 cannot cube root what unless using all the advance maths stuff which i hate.

  I see this i really @___@

  http://www.wolframalpha.com/input/?i=d/dx+[x^(5/3)-5(x)^(2/3)]

  How did the graph turns out to be like this 

  I got test again next week, my "A"s depend on you already

• Forbiddensinner

  27 Oct 09, 19:37

  Originally posted by deepak.c:

   

  Got real and imaginary.

   

   

  How to distinguish between real and imaginary? : D

  I forget all about complex numbers liao

  Tks in advance. : D

• dkcx

  27 Oct 09, 19:37

  Originally posted by Forbiddensinner:

  I see this i really @___@

  http://www.wolframalpha.com/input/?i=d/dx+[x^(5/3)-5(x)^(2/3)]

  How did the graph turns out to be like this 

  I got test again next week, my "A"s depend on you already

  Easy, u come i wack u till u cannot take the test then u will get an A..........bs for it :p

• deepak.c

  27 Oct 09, 19:55

  Originally posted by Forbiddensinner:

  How to distinguish between real and imaginary? : D

  I forget all about complex numbers liao

  Tks in advance. : D

   

  I refunded back to teacher liao.

   

   

• Forbiddensinner

  27 Oct 09, 20:03

  Originally posted by dkcx:

  Easy, u come i wack u till u cannot take the test then u will get an A..........bs for it :p

  Later you wack ler i got A+ then how? 

  Then later my educational modules also A+ as well 

  Then you will get upset and wack me somemore, then my results will keep shooting up till I get 100% 

• dkcx

  27 Oct 09, 20:07

  Originally posted by Forbiddensinner:

  Later you wack ler i got A+ then how? 

  Then later my educational modules also A+ as well 

  Then you will get upset and wack me somemore, then my results will keep shooting up till I get 100% 

  ok set. Can A 2pm tml. Come, i get ready my equipment.

• wee_ws

  28 Oct 09, 06:56

  Originally posted by Forbiddensinner:

  Need help again : (

  Anyone has any idea why is [5(x-2)] / [3(cuberootx)] < 0 for all x<0 ?

   Thanks in advance as usual. 

  Hi,

    When x < 0, x^(1/3) is negative.

    When x < 0, x - 2 < 0 so 5(x - 2) is negative.

    The result should then be positive.

    Thanks!

  Cheers,
  Wen Shih

• TrueHeart

  28 Oct 09, 17:41

  Originally posted by Forbiddensinner:

  Need help again : (

  Anyone has any idea why is [5(x-2)] / [3(cuberootx)] < 0 for all x<0 ?

   Thanks in advance as usual. 

  Hi Forbiddensinner,

  Perhaps there is a problem with the question?

  Cheers.