Find the range of values of K satisfying the inequality?

The inequality is K^2 + 9K + 14 > 0

What are the range of values of K satisfying the inequality??

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  • mizoo
    Lv 7
    7 years ago
    Favorite Answer

    k^2 + 9k + 14 > 0

    (k + 2)(k + 7) > 0

    k > -2 or k < -7

    in the interval notation : (-∞, -7) U (-2, ∞)

  • Hosam
    Lv 6
    7 years ago

    First factor the quadtratic given as (K+7)(K+2) , so now you have

    (K+7)(K+2) > 0

    Since the coefficient of K^2 is positive, the quadratic is positive if K is OUTSIDE the interval between the two roots (-7) and (-2) . This interval can be written as [-7,-2]

    So the range of K = R / [-7,-2] = (-inf, -7) U (-2, inf )

    where inf means infinity.

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