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Mathematics 7 Online
OpenStudy (anonymous):

Factor. x^3-729

OpenStudy (ajprincess):

a^3-b^3=(a-b)(a^2+ab+b^2) x^3-729=x^3-9^3 Does that help?

OpenStudy (anonymous):

yeah that makes sense because 9^3 = 729.

OpenStudy (ajprincess):

Use this to factor it a^3-b^3=(a-b)(a^2+ab+b^2) Here a=x and b=9

OpenStudy (anonymous):

So the end equation would be (x^3-9^3)

OpenStudy (ajprincess):

nope. a^3-b^3=(a-b)(a^2+ab+b^2) Plug in a=x and b=9 in (a-b)(a^2+ab+b^2)

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