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OpenStudy (anonymous):
find the difference of two cubes: 128x^3-250y^3
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Directrix (directrix):
Here's the factoring pattern for the sum or difference of two cubes. Let's see if we can apply it to your problem.
Directrix (directrix):
128 and 250 are not "perfect cubes" so factor 2 from the given expression. 128x^3-250y^3 = 2( 64 x³ - 125 y³ ) = 2* [ (4x)³ - (5y)³ ] = @ktawneil See if you can write the next step. Okay?
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