Algebra

Use the intermediate theorem to show that the polynomial function value has a zero in the given interval
f(x)=x^5-x^4+8x^3-7x^2-17x+7; [1.6,1.8]
Find the value of f(1.6)
Find the value of f(1.8)

asked by Alley
  1. My calculator gave me a negative value for f(1.6)
    and a positive value for f(1.8)

    I wonder how the graph got from below the x-axis to above the x-axis in that little interval.

    posted by Reiny
  2. What does that mean?

    posted by Alley
  3. mmmhh?

    I plugged in x = 1.6 and got some negative value
    I plugged in x = 1.8 and got some positive value
    so we have two points of your graph
    one is (1.6, -?) , the other is (1.8, + ?)
    so one is below the x-axis , the other is above the x-axis
    make a rough sketch of this situation, (it doesn't make any difference how far down or how far up you place points)
    join your two points.
    I see them crossing or intersecting the x-axis.
    Don't we call the place where a graph cuts the x-axis, "the zero of the function" ??
    I see such a point between x = 1.6 and 1.8

    posted by Reiny

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