<p>it was the wrong edition for Chemistry 4A? I mean, do I need to get another book?</p>
<p>Depends on the class and professor. For most classes, it's not a big deal because the material hasn't significantly changed in the newer edition. But for other classes it's essential because either the material has changed a lot or the chapter exercises are completely different. The best way to find out is to email the professor yourself and ask him.</p>
<p>You need the right quantitative analysis edition for 4A.</p>