pre calculus

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find the average rate of change of
f(x)=x^3-5x+3:

a. from -6 to -3
b. from -1 to 2
c. from 2 to 8

I am so lost, can someone please show me how to do this?

  • pre calculus -

    I will do the first, you do the other two....

    f(-3) = -27 + 15 + 3 = -9
    f(-6) = -216 + 30 + 3 = -183

    so avg rate of change = (-9 - (-183))/(-3-(-6))
    = 174/3 = 58

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