Find the average rate of change of f(x)= -3x^2 + 6 from x=3 to x=8.
Simplify your answer as much as possible,
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average rate of change = f(x1) - f(x2)/x1-x2
f(8) = -3(8)^2 + 6 = 186
f(3) = -3(3) ^2 + 6 = -21
average rate of change = -186 - - 21/ 8-3
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