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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: Elnino_Gerrard on November 03, 2010, 08:06:02 pm

Title: Neap 2010 exam 1 question
Post by: Elnino_Gerrard on November 03, 2010, 08:06:02 pm
Question 3c where it says f^-1(f(x) can someone explain please how they got the rule?
Title: Re: Neap 2010 exam 1 question
Post by: Souljette_93 on November 03, 2010, 08:44:52 pm
Quote from: Elnino_Gerrard on November 03, 2010, 08:06:02 pm
Question 3c where it says f^-1(f(x) can someone explain please how they got the rule?

They have just given you a function ( composite) and when you simplify it it should give you   watch out for domain though.
Title: Re: Neap 2010 exam 1 question
Post by: Elnino_Gerrard on November 03, 2010, 08:54:45 pm
no thats the thing u have negative  Square root of (x-2)^2 +2
Now how do i know whether i take the negative or positive root of (x-2)2
Title: Re: Neap 2010 exam 1 question
Post by: sajib_mostofa on November 03, 2010, 09:11:18 pm
Has anyone noticed there are a number of wrong answers in the solutions? e.g for Q9C, it says "A dilation of factor 2 from the y-axis and a reflection in the y-axis", when it should be a reflection in the x-axis.