tag:blogger.com,1999:blog-6479061363935732747.post8696106255031273369..comments2016-02-29T11:27:35.947+08:00Comments on 2011 S1-01 Maths Blog: Maths Viva Voce Question 1:Ng Ying LiangLoh Kwai Yinnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-6479061363935732747.post-33258458771126554782011-10-18T04:21:26.251+08:002011-10-18T04:21:26.251+08:00Part (i): You've described how the equation is...Part (i): You've described how the equation is derived clearly. You've pointed out the need to 'categorise' the terms (i.e. by moving the terms) and the changing of the sign. However, "why" do you do this, and "how come" the signs change? The 'balancing act' behind the equation has not been mentioned here. When we get -x=-10, it's not just because we know that x is actually positive, it's because the 'solving' is incomplete. By default, when solving equation, what we need to find is "x", and therefore stopping at the step with "-x" is considered incomplete.<br /><br />Part (ii): "cm^2" should be read as "square centimetre". You have use terms like "substitute" correctly to describe the process. You are also right to say that we can just use one of the length expressions to find the numerical value of length.<br /><br />Part (iii): The conversion is correct, however, you've missed out informing the viewer that 0.01 comes from the fact that "1 cm = 100 cm".LOH Kwai Yinhttp://www.blogger.com/profile/06503397685892227762noreply@blogger.com