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Use the rule that you are most comfortable and fastest with :)

Consider |a| = |b|, |a| < |b| and |a| > |b| where a>0, b<0 When |a| = |b| a+b = 0, and |a+b| = a+b = 0 When |a| < |b| a+b < 0 and thus |a+b| = -(a+b) which is > 0 When |a| > |b| a+b > 0 and thus |a+b| = a+b Clearly, a + b <= |a+b| for all a>0, b<0 POMOPASMDPOSAMDPOASMDPOSAMDSPODMSPO PLEASE...

Are you hinting at the fact the cases don't consider when a,b = 0 LOL. Otherwise I'm lost :'( /cry

@cricketfan1997 I use the words proof/show loosely. I still consider a show a proof, but yes in a proof question i would not do a 'show' (if that made any sense LOL). The full question says to consider the cases (a>0,b>0),(a>0,b<0),(a<0,b<0),(a<0,b>0) and show that a+b <= |a+b| So basically if...

Show that when a>0, b<0, a+b<= |a+b| I don't know how to prove something so conceptually simple :'( Btw - anybody want to be my math buddy on skype? I ask a lot of random questions and i don't have a good source of knowledge unless it's here...

Ah, i understand now - thanks! :) Didn't know it would factor to that, i just expanded everything which was a mistake haha. You drew your graph wrong btw! (double zero at x = 2)

I don't quite understand how you arrived to that D:

Yes but that will result in a fourth-degree polynomial which I don't know how to solve (havn't learnt it yet).

Anyone know how to solve this inequality algebraically? 1/(x-1)(x-3) <= -1

I don't really see the needs to write notes on that point (or any other point disregarding the history of the science). It's just basically stating that the most common forms of energy absorbed/released during reactions are light, heat and electricity. But if you insist, then yeah the only thing...

And in ionic compounds, the empirical formula is referred to as a formula unit (instead of molecules/atoms). Can't think right now (bad explanation) but you'll run into it eventually.. ><

Not tested directly, but the content learnt in year 12 will assume prerequisite knowledge from year 11.

Oh serious. How do you prevent tanning then :(

As long as you're not gunning for 99+ ATAR or something, you'll be fine with your subject selections so long you put in effort and maintain interest in them. Remember, first know yourself. Year 11 is a good time for experimentation to figure out how you best study, learn, etc in preparation for...

Well the first two modules don't really have that much of an impact on the third (water). I don't think it will be much of an issue.

Are you self learning the content? O_o

Uhm - they are all polyatomic ions, a bunch of atoms bonded together chemically to act as a single ion. I don't think polarity has anything to do with the answer here. The answer lies within how the Lewis Dot Diagrams are drawn. i. Oxygen is missing its other 6 electrons ii. Im supposing this...

Why you still at that tutor then? :( One best learns when they are having fun and comfortable with the pace.

I lost all my motivation :( Not looking forward to year 11

Got my math competition result today (which was really late). Let's just say I didn't do too well LOL...... 0 for problem solving.