Question

Please help i am really bad at these :P
1. Find -3A+6B
A= [ -3 5 -6] B= [-2 6 7]
[ 9 -5 3] [2 -1 -6]

A. [ 21 12 -24]
[-15 9 36]

B. [-3 21 60]
[48 -27 36]

C. [ 21 12 60]
[-15 -27 36]

D. [-3 21 60]
[-15 9 -45]

2. solve the matrix equation
X-[2 -8] = [ 4 -6]
[-4 2] [ 2 -8]

A. [6 -14]
[-2 -6]

B. [ 2 -14]
[ -2 -10]

C. [ 6 -14]
[ 6 -10 ]

D. [ 6 2]
[ 6 -6]

Answer 1

its just multiplication and addition ... what are you not good at?

Answer 2

well with the second one im really confused on how to do it

Answer 3

X - M = K

X = K + M

Answer 4

X - [2 -8] = [ 4 -6]
[-4 2] [ 2 -8]


X = [ 4 -6] + [ 2 -8]
[ 2 -8] [-4 2]

Answer 5

adding matrixes is just adding 'like' components ...

Answer 6

so bascially you just add across like for instance
4+ 2
then
-6+-8
and the so on

Answer 7

correct

Answer 8

if we do some moving around for convenisnence

[ 4 -6] + [ 2 -8]
[ 2 -8] + [-4 2]


[4 -6]
+ [ 2 -8]
------------



[ 2 -8]
+ [-4 2]
-------------

Answer 9

*convenience lol

Answer 10

oh okay i think i get it now thank you :)

Answer 11

youre welcome ... and that first one is just multipying all the elements of a matrix my the number ..

3A is just the A with all its elements multiplied by 3 .... multiply then work the addition :)

Answer 12

*by the number