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Mathematics 17 Online
OpenStudy (anonymous):

Help Please!!??!!!

OpenStudy (anonymous):

OpenStudy (anonymous):

\[(x ^{2}-4)\rightarrow (x+2)(x-2)\] does that further you along?

OpenStudy (anonymous):

yes

OpenStudy (helder_edwin):

did u factor the difference of cubes??

OpenStudy (anonymous):

no

OpenStudy (helder_edwin):

do u know how?

OpenStudy (anonymous):

(x-2)(x-2)(x-2) =x^3-8 ?

OpenStudy (helder_edwin):

no way

OpenStudy (helder_edwin):

\[ \large x^3-8=x^3-2^3=(x-2)(x^2+2x+2^2) \]

OpenStudy (helder_edwin):

the general formula is \[ \large a^3-b^3=(a-b)(a^2+ab+b^2) \]

OpenStudy (helder_edwin):

now u have everything factored. just plug in and simplify

OpenStudy (helder_edwin):

it is easy. tell me what u get

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