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14 Mar 2012, 18:45
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Lets say,
\(|a - c| = 4\) . If c>a then we can surely say that c-a=4.
What about the inverse. If say we know that c-a=4 & c>a. How do we approach |a - c| = 4??
This may be a very simple question?? Pls help.
\(|a - c| = 4\) . If c>a then we can surely say that c-a=4.
What about the inverse. If say we know that c-a=4 & c>a. How do we approach |a - c| = 4??
This may be a very simple question?? Pls help.
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15 Mar 2012, 07:15
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A modulus is actually an absolute value.
In this case it says that absolute value of |a-c| is 4. It depends upon two conditions.
It will be written as:
a-c = 4 , if a>c
a-c = -4, if c>a.
c>a is just one of the conditions of the modulus and hence for the inverse you need other condition also, and with that you can approach |a-c| = 4.
Hope it helps.
In this case it says that absolute value of |a-c| is 4. It depends upon two conditions.
It will be written as:
a-c = 4 , if a>c
a-c = -4, if c>a.
c>a is just one of the conditions of the modulus and hence for the inverse you need other condition also, and with that you can approach |a-c| = 4.
Hope it helps.
15 Mar 2012, 10:58
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GMATPASSION
I am not sure I understand what you are asking but this is what I gathered:
If you know that c-a=4 & c>a, then you can say that |a - c| = 4.
If distance between c and a is 4 then distance between a and c is also 4. Keep in mind that mod represents distance. It doesn't matter where you measure it from.
