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25 January, 14:50

Factor each polynomial y²-81

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Answers (2)
  1. 25 January, 15:35
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    I'm if it's right but ...

    you could square root the whole expression and get (y-9) (y-9) = (y-9) ^2
  2. 25 January, 16:59
    0
    Y^2-81 is the difference of two squares, namely, the difference of y squared less 9 squared. Therefore,

    y^2-81 = (y-9) (y+9)
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