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Mathematics 18 Online
OpenStudy (anonymous):

.

OpenStudy (anonymous):

all i need to know is if its correct or not

OpenStudy (anonymous):

if its not, then explain.

OpenStudy (hybrik):

To simplify this, you must know the difference of cubes: \[(a^3-b^3) = (a-b)(a^2+ab+b^2)\]

OpenStudy (hybrik):

So plug in the root, x^3 is x, and 729 to the 3rd root is 9, plug in x^3 and 9 into the formula

OpenStudy (hybrik):

\[(x-9)(x^2+9x+81)\]

OpenStudy (anonymous):

so im right?

OpenStudy (hybrik):

So the factors are (x-9) and (x^2+9x+1), x-9 is correct

OpenStudy (hybrik):

Medal?

OpenStudy (anonymous):

wait but isn't c correct also

OpenStudy (anonymous):

wait no nevermind :)

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