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OpenStudy (anonymous):
27u^3 - 125....please help
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OpenStudy (anonymous):
Hint: Difference of cubes. It is possible to figure out this formula using Synthetic/Long Division, but, here it is:\[a^3-b^3=(a-b)(a^2+ab+b^2)\]
OpenStudy (anonymous):
ok i've got that formula but i keep getting (3u-5) (9u^2+15u+25) but when i foil to check it doesn't come out
OpenStudy (anonymous):
It works... are you sure you're foiling correctly? Because your answer is correct.
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