Algebra II

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I'm trying to factor this and I just can't figure it out. Help?

r^4 s^4 - 81

  • Algebra II -

    difference of two squares

  • Algebra II -

    r^4 s^4 - 81

    (r^2s^2 - 9 )(r^2s^2 + 9 )

    (rs-3)(rs+3)(r^2s^2+9)

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