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This is really easy, but there is
one big thing to remember:
THE SIZES MUST BE THE
SAME!
Check it out:
Let's add these guys:
![[ row 1: 1 , 3 , 4 row 2: -7 , 0 , 5 ] + [ row 1: 6 , -3 , 11 row 2: 0 , 5 , -4 ]](images/02-matrices-01.gif)
We just add the
entries in each spot...
![[ row 1: 1 + 6 , 3 + ( -3 ) , 4 + 11 row 2: -7 + 0 , 0 + 5 , 5 + ( -4 ) ]](images/02-matrices-02.gif)
![= [ row 1: 7 , 0 , 15 row 2: -7 , 5 , 1 ]](images/02-matrices-03.gif)
That's it! So,
what do ya think -- easiest thing on the whole site?
Here's a subtraction
guy -- same idea:
![[ row 1: -2 row 2: 0 row 3: 3 row 4: 6 ] - [ row 1: 7 row 2: -8 row 3: 0 row 4: 4 ]](images/02-matrices-04.gif)
![= [ row 1: -2 - 7 row 2: 0 - ( -8 ) row 3: 3 - 0 row 4: 6 - 4 ]](images/02-matrices-05.gif)
![= [ row 1: -9 row 2: 8 row 3: 3 row 4: 2 ]](images/02-matrices-06.gif)
Notice what's going
on with the sizes... The matrices you add or subtract have to
match up!
And the answer is the
same size.
Continued on the
next
page
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