Respuestas

2013-10-29T18:01:37+01:00
X^4 = 256

256 = 2^8

x^4 = 2^8 = ( 2^2)^4

x = 2^2 =  4 

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x^5 = 243

x^5 = 3^5

x = 3 

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x^3 = -27

x^3 = (-3)^3

x = -3

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x^7 = -128

x^7 = (-2)^7

x = -2