another Q (1 Viewer)

[coca cola]

i posted this in the other thread but i don't think many people sees it so, i really need some help with this.

use:
ab+bc+ca <= a^2 + b^2 + c^2

show:
(bc)^2 + (ac)^2 + (ab)^2 <= bc(a)^2 + ac(b)^2 + ab(c)^2



can you just times each terms individually like that, if you know what i mean? this does not seem obvious to me, any explaination of why?

 

[ngai]

haha go read ur other thread

 

[coca cola]

why can't i get it to work? did you type it wrong or did i not read it correctly.

can some one do this for me please.

 

[coca cola]

some help please, im not very good at this inequalities.

 

[xiao1985]

uhm... not sure wut u meant there, but i think RTP >= not <=...

here's my soln...

 

[coca cola]

ahh thanks xiao. yeah it was the other way, the edit option seems to be a little odd, it does not edit properly.

how would you know how to do that though? by intuition or do you already know it from a book, because i can never see that kind of solution without some sought of hint.

 

[xiao1985]

ahh thanks xiao. yeah it was the other way, the edit option seems to be a little odd, it does not edit properly.

how would you know how to do that though? by intuition or do you already know it from a book, because i can never see that kind of solution without some sought of hint.

well for ineqlty, u need to manipulate the pronumerals abit... learn to play around with it, and try out different things... usually u'd go down the right track... if u dont', then i'd usually start from stratch and go down a different direction...