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if a negative number is raised to a odd number than what is it?

 Sep 11, 2015
 #1
avatar+130516 
0

A negative raised to an odd power will result in a negative.

 

 

cool cool cool

 Sep 11, 2015
 #2
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0

but will it always be a negative?

 Sep 11, 2015
 #3
avatar+130516 
+5

Proof:  [ let a > 0....so -a < 0 ....and let 2n + 1 be some odd integer]

 

(-a)2n + 1     =

 

(-a)2n * (-a) =

 

(-1 * a)2n * (-1 * a) =

 

(-1)2n * (a)2n * (-1)* (a)  =

 

(-12)n * (a2)n * (-a)  =

 

(1)n * (a2)n * (-a)  =     [1 raised to any power = 1....so we can ignore this term ]

 

(a2)n * (-a)    ....      and a2  for any "a" not equal to 0 is always positive....and a positive raised to any power "n" is also positive....so....the first term is always positive....and since -a < 0, the entire expression is < 0

 

 

cool cool cool

 Sep 11, 2015

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