-x = 2

frenchyff

New member
Joined
Oct 31, 2013
Messages
7
-x = 2
I know that x = -2 I just want to know why i am able to Divide both sides by -1.
is -x the same as (-1 times x) or is there a case where this is not true.
 

srmichael

Full Member
Joined
Oct 25, 2011
Messages
848
-x = 2
I know that x = -2 I just want to know why i am able to Divide both sides by -1.
is -x the same as (-1 times x) or is there a case where this is not true.
Yes, -x is the same as -1* x or you can also write it as (-1)x
 

JeffM

Elite Member
Joined
Sep 14, 2012
Messages
3,258
-x = 2
I know that x = -2 I just want to know why i am able to Divide both sides by -1.
is -x the same as (-1 times x) or is there a case where this is not true.
Or you can use multiplication

\(\displaystyle -x = 2 \implies (- 1 ) * (- x) = (-1) * 2 \implies x = - 2.\)

In general. \(\displaystyle - ax = u \implies (-1) * (-ax) = (-1) * u \implies ax = -u.\)
 

frenchyff

New member
Joined
Oct 31, 2013
Messages
7
Thanks guys this helped me alot. I am just beginning so thanks for being kind
 
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