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March 30, 2017

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I have to figure out how x^3+216=0 is factored, and what potential solutions might be. I factored it like this: (x+3)(x+3)(x+24), resulting in the solutions being -3 (double route) and -24. But my book says these are not correct answers. Why not? Can you show me how to do it the right way? Thanks!

  • Algebra - ,

    Use
    A³+;B³=(A+B)(A²-AB+B²)
    A³-;B³=(A-B)(A²+AB+B²)
    and note that 216=6³

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