when is the last day of SPM ?

sulphate gua

you refer to a chart / table under that chapter ... there is a list about this.
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I'm not sure about iodide

no need to know all (unless you are going to attend professional exam).
seriously, under spm field, it had been limited. so, just focus to it.

his only hobby and I guess he enjoy it very much.

same me .... what for to study all the time ? bagus I pergi shopping sekarang.
--
But spm candidates don't Dota now. Suffer few more weeks and then crazy whatever you like lah.

apa ni E and G ?

I faham D&G lah .. but .. :hmmm:
--

Chow ... shopping

This post has been edited by work_tgr: Nov 9 2008, 02:45 PM

boleh tahan lah. you already learned what ... how is it ?

apa ni ?

Nak tolong cam nama ?

ae leh ... last time you ask question about mirror and lens ... I have good memory

ya .. itu dia. hafal semua !

after you study ..give your opinion larr ..

no tip no tip ... sorry, I can't help

Tak nampak lah. It's gelap at the LHS

If x and y are the roots of the equation 2x^2 - 3x + 4 = 0, find the value of:-

i) x^2 + y^2
ii) 1/x + 1/y
iii) Hence, construct the quadratic equation with the roots x^2 + 1/y and y^2 + 1/x.

i) x^2 + y^2
=(x+y)^2-2xy
=(SOR)^2-2(POR)
=(3/2)^2-2(2)
=-7/4

ii) 1/x + 1/y
=(y+x)/xy
= SOR/POR
=(3/2)/2
=3/4

iii) x^2 + 1/y and y^2 + 1/x.

(x^2 + 1/y)+(y^2 + 1/x)
=(yx^2)/y+(xy^2)/x
=(yx^3+xy^3)/xy
=x^2+y^2
=-7/4

(x^2 + 1/y)(y^2 + 1/x)
=[(yx^2)/y][(xy^2)/x]
=(xy)^3/xy
=(xy)^2
=4

x^2+(7/4)x+4=0
4x^2+7x+16=0 --- wrong

This post has been edited by work_tgr: Nov 9 2008, 08:54 PM

--opps/ my bad, wrong

(xy)^2

the meaning is straight and obvious

well .. maybe you should stop online