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Mathematics 12 Online
OpenStudy (anonymous):

x^3-216

hartnn (hartnn):

\((a^3-b^3) = (a-b)(a^2+ab+b^2)\) here a= x b=6

OpenStudy (anonymous):

for some reason my answers aren't right, I came up with (x-9)(x^2+8x+9)

hartnn (hartnn):

you took b= 9 ?

OpenStudy (anonymous):

but the cube root of 216 is 72...I'm not understanding where to put the 72 lol

hartnn (hartnn):

cube root of 216 = 6

OpenStudy (anonymous):

oh..

hartnn (hartnn):

\(216 =6*6*6\)

OpenStudy (anonymous):

soooo.... (x-6)(x^2+6x+72) ????

hartnn (hartnn):

b^2= 6*6 =36

hartnn (hartnn):

not 72

OpenStudy (anonymous):

okay so in place of 72 i should put 36

OpenStudy (anonymous):

(x-6)(x^2+6x+36) ?

hartnn (hartnn):

you got it :)

OpenStudy (anonymous):

thanks :)

hartnn (hartnn):

welcome ^_^

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