How to calculate the value of C, if -C=1?

Indranil

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Joined
Feb 22, 2018
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How to calculate the value of C, If -C=1?
 

ksdhart2

Full Member
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Mar 25, 2016
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982
How to calculate the value of C, If -C=1?
Here's a big hint that will take you almost all of the way: -C is notational shorthand for (-1)C.
 

Indranil

Junior Member
Joined
Feb 22, 2018
Messages
215
Here's a big hint that will take you almost all of the way: -C is notational shorthand for (-1)C.
I am doing the calculation here below
or, -C=1
or, (-1)C=1
or, C=1/-1
or, C=-1/1=-1
Please check my steps if I am wrong.
 

HallsofIvy

Elite Member
Joined
Jan 27, 2012
Messages
4,795
I am doing the calculation here below
or, -C=1
or, (-1)C=1
or, C=1/-1
or, C=-1/1=-1
Please check my steps if I am wrong.
That is correct. Another way to approach it is to multiply both sides by -1 since (-1)(-1)= 1.
 

Jomo

Elite Member
Joined
Dec 30, 2014
Messages
3,018
I am doing the calculation here below
or, -C=1
or, (-1)C=1
or, C=1/-1
or, C=-1/1=-1
Please check my steps if I am wrong.
Another way to do this is to realize if two quantities are equal, then if you change their signs they will still be equal.

Some examples: 2 = 2 so -2 = -2. -9 = -9 so 9 = 9. .01 = .01 so -.01 = -.01. Now if -C = 1 just change both signs and get C = -1.

Now why does this work? It is equivalent to multiplying both sides by (-1) (as already pointed out)
 

Indranil

Junior Member
Joined
Feb 22, 2018
Messages
215
Thank you all.
 
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