math 1

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what is c squared minus 6cd plus 9d squared minus 4

  • math 1 -

    write it this way:

    c^2 - 6cd + 9d^2 - 4
    = (c - 3d)^2 - 4
    now I see a difference of squares

    = (c-3d + 2)(c-3d-2)

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