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krod82 krod82
  • 18-08-2015
  • Mathematics
Answered

what is x cubed minus 8

Verified Answer :

RedRicin
RedRicin RedRicin
  • 18-08-2015

Since \(x^3-8\) is a sum of cubes, (-8 is -2 cubed) it can be factored like so:

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

\(a^3=x^3\implies a=x\)
\(b^3=-8\implies b=-2\)

\(x^3-8=(x+(-2))(x^2-x(-2)+(-2)^2)=\boxed{(x-2)(x^2+2x+4)}\)

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