The graph of a cubic function $p(x)$ is shown in the first diagram below, for $0 \leq x \leq 4$, $x \in \mathbb{R}$ - Leaving Cert Mathematics - Question 6(c) - 2022
Question 6(c)
The graph of a cubic function $p(x)$ is shown in the first diagram below, for $0 \leq x \leq 4$, $x \in \mathbb{R}$. The maximum value of $p'(x)$ in this domain is 1... show full transcript
Worked Solution & Example Answer:The graph of a cubic function $p(x)$ is shown in the first diagram below, for $0 \leq x \leq 4$, $x \in \mathbb{R}$ - Leaving Cert Mathematics - Question 6(c) - 2022
Step 1
Plot the point at $x = 0$
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Answer
The derivative p′(0)=−3, which means we plot the point (0, -3).
Step 2
Plot the point at $x = 1$
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Answer
Given the graph of p(x), the slope of the tangent at x=1 indicates that p′(1)=0. Therefore, we plot the point (1, 0).
Step 3
Plot the point at $x = 2$
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Answer
At x=2, the graph of p(x) shows a local maximum; hence, p′(2)=1. We plot the point (2, 1).
Step 4
Plot the point at $x = 3$
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At x=3, the slope of the tangent is also 0, indicating that p′(3)=0. Thus, we plot the point (3, 0).
Step 5
Plot the point at $x = 4$
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Finally, at x=4, the graph of p(x) indicates that p′(4)=−3. Hence, we plot the point (4, -3).
Step 6
Draw the graph of $p'(x)$
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Answer
Now, connect the plotted points (0, -3), (1, 0), (2, 1), (3, 0), and (4, -3) with a smooth curve, ensuring the correct shape of the cubic function is represented. The graph should reflect the changes in slope as seen in the original cubic function's graph.
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