-x = 2

frenchyff

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Oct 31, 2013
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-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.
 
-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
 
-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

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

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