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Mathematics 13 Online
OpenStudy (anonymous):

27u^3 - 125....please help

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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