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Math Help - Without graphing, describe the end behavior of the graph of....

  1. #1
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    Without graphing, describe the end behavior of the graph of....

    two different problems

    a) g(x) = 2x^4 + 1

    and

    b) f(x) = 4x - 5x^3

    Thanks so much & happy thanksgiving everyone!
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  2. #2
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    Quote Originally Posted by gnarlycarly227 View Post
    two different problems

    a) g(x) = 2x^4 + 1

    and

    b) f(x) = 4x - 5x^3

    Thanks so much & happy thanksgiving everyone!
    a. g(x)= 2x^4 + 1. The highest power in this function, 4, is even so the graph is an even function so end behavior is as x approaches negative infinity, y approaches infinity and as x approaches infinity, y approaches infinity. Sometimes called "up, up" behavior.

    b. f(x)= 4x-5x^3. Because both powers are odd, this is an odd function. As you can as x gets larger, the entire function gets smaller. So as x approaches infinity, f(x) approaches negative infinity. Because the function is odd, it has the opposite behavior as x approaches negative infinity.
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