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#1 2006-12-19 12:36:38
- Kiran
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- Registered: 2006-11-15
- Posts: 177
A - B
If _ _ _ _
A = | 2 0 | B = | 2 5 |
| 2 2 | , and | 2 2 | , find A - B
i did :
A = (2 * 0 ) - (2 * 2) = 0 - 4 = -4
B = ( 2* 2 ) - ( 2* 5 ) = 4 - 10 = -6
A - B
-4 - (-6) = 2 right?
ok if that is right now can i ask something what does this mean in teh problem _ when its on top of the problem or on top of the number?
Live 4 Love
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#2 2006-12-19 19:24:19
- luca-deltodesco
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- Registered: 2006-05-05
- Posts: 1,470
Re: A - B
are these not matrices?
The Beginning Of All Things To End.
The End Of All Things To Come.
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#3 2006-12-21 04:23:30
- Kiran
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- Registered: 2006-11-15
- Posts: 177
Re: A - B
oh right this is the way ..thanks
but like is said
_ _ _ _
| 2 2 | | 2 5 |
| 2 0 | | 2 2 |
you see that there is a line on the five and there are lines liek this _ in teh problem what do they mean? nothing?
Live 4 Love
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#4 2006-12-21 04:34:00
- Kiran
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- Registered: 2006-11-15
- Posts: 177
Re: A - B
and i think the way you did it is has to be
2 2
2 0
not
2 0
2 2
so the answer would come out to
0 -3
0 -2
right?
Live 4 Love
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#5 2006-12-21 10:02:28
- MathsIsFun
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- Registered: 2005-01-21
- Posts: 7,713
Re: A - B
Matrix subtraction is actually so simple it is hard to believe.
Like luca said, just subtract matching entries. And you get:
0 -5
0 0
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
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