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mitosuki

  • 4 years ago

Using complete sentences, explain how you would factor completely x^9 –27. Please Help!!

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  1. Harkirat
    • 4 years ago
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    here we can use the identity a^3 - b^3 = (a - b)(a^2 + ab + b^2) by manipulating x^9 - 27 as follows x^9 - 27 = (x^3)^3 - (3)^3 using above identity we get (x^3 - 3)[(x^3)^2 + (x^3)(3) + (3)^2] (X^3 - 3)(x^6 + 3x^3 + 9)

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