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orbie

  • 4 years ago

Find the average rate of change of the function f over the given interval. f(x)=0.25x^4-x^2-9x+8 from x=-4 to x=3

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  1. freckles
    • 4 years ago
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    \[\frac{f(-4)-f(3)}{-4-3}\] Use this to find the slope of the secant line from x=-4 to x=3

  2. orbie
    • 4 years ago
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    I don't understand how you put that into the problem.

  3. freckles
    • 4 years ago
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    No you put the problem into that

  4. freckles
    • 4 years ago
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    Do you know how to find f(-4)?

  5. orbie
    • 4 years ago
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    Would you put it into the equation?

  6. freckles
    • 4 years ago
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    Replace the x's in your function with -4's

  7. freckles
    • 4 years ago
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    Then to evaluate f(3) Replace the x's in your function with 3's

  8. orbie
    • 4 years ago
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    So what I got is for f(-4)= 92 and f(3)= -7.75...is that right?

  9. freckles
    • 4 years ago
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    That is right ! :)

  10. freckles
    • 4 years ago
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    \[\frac{92-(-7.75)}{-4-3}\]

  11. orbie
    • 4 years ago
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    Ooooh wow I get it now! Thank you so much!

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