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I am trying to work out standard deviations and have to square numbers I am getting two different answers if I use the X2 square function it comes out as a negative if I just times the number by itself it comes out positive which one is right

 

-0.2 X -0.2 =

Guest Apr 7, 2017
 #1
avatar+27219 
+1

"I am trying to work out standard deviations and have to square numbers I am getting two different answers if I use the X2 square function it comes out as a negative if I just times the number by itself it comes out positive which one is right"

 

-22 = -4  because exponentiation takes priority over negation

 

(-2)2 = +4  because parentheses take highest priority

 

So -2 x -2 = +4  because -2 x -2 is the same as (-2)2

 

.

Alan  Apr 7, 2017

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