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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE General & Further Mathematics => Topic started by: j4st_an2 on November 04, 2011, 07:57:21 pm

Title: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: j4st_an2 on November 04, 2011, 07:57:21 pm
Gotta use th   Matrix identity form. >>  1 0 0          1  1     use 1s or any other number. as element in matrix B. TRIAL AND ERROR
                                                              0 1 0    X    1  1
                                                              0 0 0          1  1
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: Natters on November 04, 2011, 08:00:07 pm
really it doesnt matter which rows you put matrix A's  1's in, its just whether you should use them both in one row or in different ones, only two trials required surprisingly
im still pretty sure theres a quicker way than that though, somehow
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: j4st_an2 on November 04, 2011, 08:04:17 pm
lol ur right. trial and error i guess.
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: xXjAmEZXx on November 04, 2011, 08:27:38 pm
i did trial and error, putting 2 1's in each row then putting individual 1's in 2 rows. i had 50 minutes leftover in the exam so i had time and out of the combinations i did 2 was the minimum. im sure theres probably a more mathematical and faster way though.
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: tha boss on November 04, 2011, 08:39:22 pm
what happened to the seven elements are zero it didnt make sense? a 3x3 matrix?
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: Keo on November 04, 2011, 08:42:20 pm
Quote from: tha boss on November 04, 2011, 08:39:22 pm
what happened to the seven elements are zero it didnt make sense? a 3x3 matrix?

there are 9 elements in a 3x3 matrix, 7 of these elements are 0
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: tha boss on November 04, 2011, 08:43:32 pm
Quote from: Keo on November 04, 2011, 08:42:20 pm
Quote from: tha boss on November 04, 2011, 08:39:22 pm
what happened to the seven elements are zero it didnt make sense? a 3x3 matrix?

there are 9 elements in a 3x3 matrix, 7 of these elements are 0
yea confused the jesus out of me fkkk i picked 0
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: Keo on November 04, 2011, 08:45:37 pm
Quote from: tha boss on November 04, 2011, 08:43:32 pm
Quote from: Keo on November 04, 2011, 08:42:20 pm
Quote from: tha boss on November 04, 2011, 08:39:22 pm
what happened to the seven elements are zero it didnt make sense? a 3x3 matrix?

there are 9 elements in a 3x3 matrix, 7 of these elements are 0
yea confused the jesus out of me fkkk i picked 0

haha dw man, next exam!
just wondering you go Keysborough secondary college?
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: tha boss on November 04, 2011, 09:15:44 pm
Quote from: Keo on November 04, 2011, 08:45:37 pm
Quote from: tha boss on November 04, 2011, 08:43:32 pm
Quote from: Keo on November 04, 2011, 08:42:20 pm
Quote from: tha boss on November 04, 2011, 08:39:22 pm
what happened to the seven elements are zero it didnt make sense? a 3x3 matrix?

there are 9 elements in a 3x3 matrix, 7 of these elements are 0
yea confused the jesus out of me fkkk i picked 0

haha dw man, next exam!
just wondering you go Keysborough secondary college?
yea
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: Natters on November 04, 2011, 09:57:03 pm
random questions with no follow up <3
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: Dominatorrr on November 04, 2011, 10:11:28 pm
This is one of the 2 questions I derped, I accidentally put 8 0's in the 3 by 3 matrix instead of 7, wasn't thinking straight at all, fairly disappointed. So because of this, I got D = 4 instead.
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: Natters on November 04, 2011, 10:26:46 pm
little mistakes like that are so costly in further
that's literally like study score minus one, just because of that
Title: Re: How I got 2 as minimum no.of zero in VCAA 2011 matrices q9
Post by: Furbob on November 04, 2011, 11:06:23 pm
yeah I did what the OP did, but I used x's instead of 1's

I did the same for the goat question as well!