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March 25, 2017

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factor 80x5th power -360x3rd power + 405x

  • algebra - ,

    80x^5 - 360x^3 + 405x
    5x(80x^4 - 72x^2 + 81)
    in parentheses is just a quadratic in x^2, so
    x^2 = (9 ± 16i)/20
    Now, just take the square roots of those complex numbers to get your other factors :-)

    Sure there's no typo there?

  • algebra - Oops - ,

    Oops 80/5 = 16. Makes a big difference

    5x(16x^4 - 72x^2 + 81)
    5x(4x^2 - 9)^2
    5x(2x-3)(2x-3)(2x+3)(2x+3)

  • algebra - ,

    54x3y

  • algebra - ,

    sorry that answer was wrong tis is the right one 3x(43+82/3)*(879/615=y78)

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