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7 July, 08:14

Ray and Kelsey are working to graph a third-degree polynomial function that represents the first pattern in the coaster plan. Ray says the third-degree polynomial has 4 intercepts. Kelsey argues the function can have as many as 3 zeros only. Is there a way for the both of them to be correct? Explain your answer.

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  1. 7 July, 08:22
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    Hints:

    Intercepts could mean either x-intercept or y-intercept.

    3 zeroes means three x-intercepts.
  2. 7 July, 08:36
    0
    Sure there is.

    The function has three zeros ... it crosses the x-axis in 3 places.

    Those are three x-intercepts.

    It also crosses the y-axis. That's not a 'zero' or solution,

    but it's the fourth intercept.

    I slapped together a "third-degree polynomial function" in a hurry

    that I think does the job. I'm not positive ... you should check it:

    f (x) = x³ + 6x² + 11x + 6

    ==> f (x) is zero when x = - 3 or - 2 or - 1 ... those are three x-intercepts.

    ==> f (x) is 6 when x = 0 ... that's the y-intercept.

    I don't know what "the first pattern in the coaster plan" means.
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