Question

q

Answer 1

the question in pic

Answer 2

hi alooy is this the answer or question?

Answer 3

its a question

Answer 4

@Rajanmathhelp

Answer 5

Hey,
firstly you multply the A*b THEN FIND THE INVerse of it.

Answer 6

okay than the second part of question how i do with it ???

Answer 7

@Lion.k

Answer 8

the second one you also need to put into matrix form.
matrix = vertically(x,y,z)
then you need to multiply both of them by the inverse.

Answer 9

well i did the a*b*c ..its gives identity matrix

Answer 10

so can u show me hw plz coz im a bit confused @Lion.k

Answer 11

hold on a sec.

Answer 12

I mean ideantity = (1,0,0;0,1,0;0,0,1]

Answer 13

Why you x by c?

Answer 14

becuase you need the identity matrix, to get x , y, z on their own.
to find the solution for the system of equation.

Answer 15

why you didnt choose another equation? A or B?

Answer 16

they dont give identity matrix.
when they asked to do A*B*C it gave identity...

Answer 17

Could you show me how to do it because am confused

Answer 18

[4,7,-13,1,-5,-1;-2,1,11]*[6,10,8;1,-2,1;1,2,3]*[x,y,z] = [4,7,-13,1,-5,-1;-2,1,11]*[4500;0;1080]

Answer 19

hold on..

Answer 20

There is one thing that you SHOULD KNOW, that is when you multiply by the systems of equation either ones of the following matrix(should be the inverse) you should get the identity.

if you don't then you doing something wrong. the idea is to convert the system of question in just (x,y,z) so to get it, it has to be identity matrix. on the right you do the same thing.


usaully they will give you the inverse but in this question they didn't.

Answer 21

okay, i'll try to do it first

Answer 22

i cant freaking draw, to explain,

[4,7,-13,1,-5,-1;-2,1,11]*[6,10,8;1,-2,1;1,2,3]*[x,y,z] = [4,7,-13,1,-5,-1;-2,1,11]* [4500;0;1080]


on the right you will get [1,0,0;0,1,0;0,0,1][x,y,z] = [3960;3420;2880]

Answer 23

the method you are suppose to use is
fined the INVERSE OF A*B
and instead of using c, put the of inv of a*b

(inverse(a*b)) * [6, 10, 8; 1, -2, 1; 1, 2 , 3]*[x,y,z] =( inverse(a*b)) *[4500,0,1080]