You can put this solution on YOUR website! factor completely: 64x^3-25x
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First factor out what's common among both terms (x):
x (64x^2-25)
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Notice that we can rewrite as:
x ((8x)^2-(5)^2)
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Which is a "difference of squares" (special case) so we can factor:
x(8x-5)(8x+5)