Sandwich Posted April 30, 2009 Report Share Posted April 30, 2009 Although the syllabus makes no mention of it, several of the textbooks I use (Haese & Haese, for example) teach integration by substitution. I sort-of understand it, but if I'm to learn it for the exam (ahhh can't believe it's less than a week!!!) I'll need quite a bit of practice, as I'm kind-of hopeless with these things otherwise.So does anybody know if there'll be questions which require solutions found through substitution?Despite a lack of mention in the syllabus, it's not exactly specific about it one way or the other! Reply Link to post Share on other sites More sharing options...
moneyfaery Posted April 30, 2009 Report Share Posted April 30, 2009 (edited) Are you using the blue or black H&H book? Integration by substitution is definitely needed at HL but I'm not too sure about SL. If they do ask you to do it, they'll probably give you the substitution to make it easier. Edited April 30, 2009 by Irene Reply Link to post Share on other sites More sharing options...
Sandwich Posted April 30, 2009 Author Report Share Posted April 30, 2009 The black SL one I've found some substitution in an old exam question but it's from quite some time ago and it does give you the value of u in the question-- then another of them doesn't. All in all it's quite confusing! Reply Link to post Share on other sites More sharing options...
moneyfaery Posted April 30, 2009 Report Share Posted April 30, 2009 Well, the syllabus has changed since then so I'm not sure. Old exams seem to be harder than the newer ones. I'd bet that you probably don't need to know it... but don't take my word for it! Reply Link to post Share on other sites More sharing options...
Ashika Posted April 30, 2009 Report Share Posted April 30, 2009 I can remember learning u-subs in SL! I wrote the exam last May. Reply Link to post Share on other sites More sharing options...
__inthemaking Posted April 30, 2009 Report Share Posted April 30, 2009 I wrote mine back in May 2007 but I remember doing integration by substitution in math SL. Reply Link to post Share on other sites More sharing options...
Hyperbole Posted April 30, 2009 Report Share Posted April 30, 2009 I may be utterly dense saying this, but- exactly what do you mean with "integration by substitution"? If you explain a little how it works I may recognise or not recognise it (and be toast or not toast depending on whether we should know it or not...).It doesn't ring any bells, though, and I'm also doing my exams next week. (OMG EEP.) Reply Link to post Share on other sites More sharing options...
moneyfaery Posted April 30, 2009 Report Share Posted April 30, 2009 Integrate lnx/x dxYou could either do this by inspection or by subbingu=lnxdu=1/x dxyieldingu duwhich integrates to1/2 u2 + csubbing back the value for u gives1/2 (lnx)2 + cJust an example off the top of my head. Sorry, too lazy to use LaTex today. Reply Link to post Share on other sites More sharing options...
Abu Posted May 1, 2009 Report Share Posted May 1, 2009 You all are forgetting that the syllabus changed in 2008. Therefore all SL exams post 2008 might not have integration by substitution. If it's not in the syllabus, it won't come in the paper. Simple as that.The H&H book was written ages ago for syllabus that was pre 2006 probably. The maths syllabus has changed twice in the past 3 years, once in '06 and once in '08. Reply Link to post Share on other sites More sharing options...
1-2-3 Posted May 1, 2009 Report Share Posted May 1, 2009 I'm taking Math SL & our teacher gave us worksheets to practice integration by susbtitution. Reply Link to post Share on other sites More sharing options...
Sandwich Posted May 1, 2009 Author Report Share Posted May 1, 2009 Reading the syllabus change, though, it's actually not altered the content, only the fact that we're no longer allowed a calculator for both papers!I think I'm going to at least look at it just in case, then. Reply Link to post Share on other sites More sharing options...
Mahuta ♥ Posted May 1, 2009 Report Share Posted May 1, 2009 We had to learn integration by substitution, there are many things that i cant do without that method. What did you learn Alice? Reply Link to post Share on other sites More sharing options...
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