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Math Help - Need Help Finding Domain and Range, Multiple Choice

  1. #1
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    Need Help Finding Domain and Range, Multiple Choice

    Determine the domain and the range of the function
    f(x)=x+4x+9

    A)Domain: (-∞, -2], Range:[5,∞)

    B)Domain: (-∞,∞) Range: (-∞,∞)

    C)Domain:[5,∞) Range: (-∞,∞)

    D)Domain: (-∞,∞), Range:[5,∞)

    Thank you.
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  2. #2
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    Quote Originally Posted by beachbunny619 View Post
    Determine the domain and the range of the function f(x)=x+4x+9
    A)Domain-∞, -2], Range:[5,∞)
    B)Domain-∞,∞) Range-∞,∞)
    C)Domain:[5,∞) Range-∞,∞)
    D)Domain-∞,∞), Range:[5,∞)
    The domain of any polynominal is the set of real numbers: \left( { - \infty ,\infty } \right).
    For this one the miminum is at x=-2.
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  3. #3
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    Quote Originally Posted by Plato View Post
    The implied domain of any polynominal is the set of real numbers: \left( { - \infty ,\infty } \right).
    For this one the miminum is at x=-2.
    I'd suggest adding the red word to avoid confusion by novices when they meet questions that define a polynomial over a restricted domain ....
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