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anonymous

  • one year ago

Which polynomial represents a difference of cubes? x^3 -64 4x^3 -1 8x^3 +27 4x^3 -125

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  1. anonymous
    • one year ago
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    @welshfella

  2. welshfella
    • one year ago
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    a cube is the result when a number or variable is multiplied by itself 3 times for example the cube of x = x*x*x = x^3 the cube of 2 is 8 because 2 * 2* 2 = 8 and 2 is called the cube root of 8

  3. welshfella
    • one year ago
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    a difference, of course, is when one number or variable is subtracted from another

  4. welshfella
    • one year ago
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    So which one do you think is difference of 2 cubes?

  5. welshfella
    • one year ago
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    a few more cubes are 3^3 = 27 4^3 = 64 5^3 = 125

  6. anonymous
    • one year ago
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    x^3-64?

  7. welshfella
    • one year ago
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    right

  8. welshfella
    • one year ago
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    is 4x^3 a perfect cube?

  9. anonymous
    • one year ago
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    yea

  10. welshfella
    • one year ago
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    Ah caught you there! x^3 is one but 4 is not 4 is a perfect square But 8x^3 is a cube 2x*2x*2x = 8x^3

  11. anonymous
    • one year ago
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    lol oh ok. Thank u.

  12. welshfella
    • one year ago
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    yw

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