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solve c(x)=x^2-40x+405

  • Math - ,

    C(x) = x^2 - 40x + 405 = 0,
    Use the Quadratic Formula:

    x = ( 40 +- sqrt(400-1620)) / 2,
    x = (40 +- sqrt(-20)) / 2,
    x = (40 +- sqrt(20*-1)) / 2,
    x = (40 +- 4.47i) / 2,

    Solution Set:
    x = 20 + 2.24i.
    x = 20 - 2.24i.

  • Math - ,

    Correction:Replace 400 with 1600.

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