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Math (Algebra)

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One root of the quadratic equation x^2 − 2x + m = 0 is 9. If the other root is n, what is n−m?

  • Math (Algebra) -

    x^2-2x+m = (x-9)(x-n)
    so,
    -2 = -(n+9)
    m = 9n

    n = -7
    m = -63

    m+n = -70

  • Math (Algebra) -

    thanks a lot steve

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