math

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how do u factor these polynomials~
5x^2 - 5x-60

81-x^4

18a^2b-50b

  • math -

    (5x-20)(x+3)

    -(x^2-9)(x^2+9)

    Then are you sure the third one is written right? 18a^2b- is a to the 2b or is b something else

  • math -

    its A squared b

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