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Factor over {complex numbers}

9x^2 + 49

  • Math -

    how about ...

    (3x + 7i)(3x - 7i) ?

    (3x + 7i)(3x - 7i)
    = 9x^2- 49i^2, but i^2= -1
    = 9x^2 - 49(-1)
    = 9x^2 + 49

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