ATAR Notes: Forum

VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: chickenpop on November 07, 2010, 02:15:42 pm

Title: Confused about a MAV questions
Post by: chickenpop on November 07, 2010, 02:15:42 pm

I used det to find a< (1/4), hence chose C, but the answer was E. Can anybody help explain why 0 isn't part of 'a'?

(http://img257.imageshack.us/img257/2354/24385956.png)

Title: Re: Confused about a MAV questions
Post by: Elnino_Gerrard on November 07, 2010, 02:17:07 pm

I says in the q a is a non zero constant

Title: Re: Confused about a MAV questions
Post by: stonecold on November 07, 2010, 02:19:52 pm

let them equal to each other, then times through by x

rearrange to get into quadratic form.  The find the value of a for discriminant >0

Title: Re: Confused about a MAV questions
Post by: chickenpop on November 07, 2010, 02:27:29 pm

ahh, I did not see that lol

Title: Re: Confused about a MAV questions
Post by: stonecold on November 07, 2010, 02:29:15 pm

oh sorry.  yeah it cant be 0 anyway.

y=0 only intersects once...