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Sagot :
Answer:
The average rate of change = -132.40
Explanation:The given function is:
f(x) = -10x³ + 7x² - 5x - 4
At x₁ = -0.7
f(-0.7) = -10(-0.7)³ + 7(-0.7)² - 5(-0.7) - 4
f(-0.7) = 6.36
At x₂ = 4.2
f(4.2) = -10(4.2)³ + 7(4.2)² - 5(4.2) - 4
f(4.2) = -642.4
The average rate of change of f(x) is calculated as:
[tex]\begin{gathered} \frac{\triangle f(x)}{\triangle x}=\frac{f(x_2)-f(x_1)}{x_2-x_1} \\ \frac{△f(x)}{△x}=\frac{f(4.2)-f(-0.7)}{4.2-(-0.7)_{}} \\ \frac{△f(x)}{△x}=\frac{-642.4-6.36}{4.2+0.7_{}} \\ \frac{△f(x)}{△x}=\frac{-648.76}{4.9_{}} \\ \frac{△f(x)}{△x}=-132.40 \end{gathered}[/tex]The average rate of change = -132.40
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