Question 303998
 If x and y are integers, which of the following is equivalent to {{{(2x)^(3y)-(2x)^y?}}} 
A. (2x)^2y 
B. 2^y(x^3-x^y)
C. (2x)^y[(2x)^2y-1]
D. (2x)^y(4x^y-1)
E. (2x)^y[(2x)^3-1] 
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A is a monomial, so it's out.
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B. 2^y(x^3-x^y) = 2^y*x^3 - 2^y*x*2y  That's not it
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C. (2x)^y[(2x)^2y-1] = (2x)^3y - (2x)^y  That's it.
It's C