Displayed below is a graph of the function .
Drag the BIG WHITE POINT along the graph of this function to trace out the graph of the derivative of this function.
Does this function look familiar?
Interact with this applet for a minute, then answer the question that follows.
1.
Why is the derivative of the function never negative? Explain how you know.
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Since the function f is always increasing, the slope of its tangent line always remains positive. Thus, the output of its derivative function, f', is always positive.
2.
Rewrite the equation in exponential form.
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or
3.
Use implicit differentiation to differentiate both sides of this equation (you wrote in your response for (2)) with respect to x. Then solve for y. What do you get?
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4.
Rewrite solely in terms of x.
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.
Thus, .
Thus, the graph of the blue function is the right branch of the function . Note that it is the right branch only because the domain of the function is .