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College Algebra

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x^3-5x^2+4x-20 > 0 interval notation

  • College Algebra - ,

    factor by grouping
    x^2(x-5) + 4(x-5) > 0
    (x-5)(x^2+ 4) > 0

    x^2 + 4 is always positive, so for the whole thing to be positive
    x-5 > 0
    x > 5

    express it in the form you were taught.

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