Which expression is equivalent to open paren 256 x to the 16th power close paren raised to the 1 fourth power ?

Apply the exponent 1/4 to each factor: 256^(1/4) · (x^16)^(1/4). Since 4^4 = 256, the first factor is 4, and the second is x^4. The equivalent expression is 4x^4, choice B.

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