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Analyze the function h(x) = x3 − 2x2 − 15x, finding intercepts and stationary points.
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| Point | x | y |
|---|---|---|
| x-intercept | −3 | 0 |
| Maximum | −1.67 | 14.81 |
| x-intercept | 0 | 0 |
| Minimum | 3 | −36 |
| x-intercept | 5 | 0 |
Step-by-step solution
4 stepsLet's complete the analysis for function (c) .
Find the intercepts with the axes.
To find the y-intercept, set :
The y-intercept is .
To find the x-intercepts, set :
Factor out :
Factor the quadratic expression:
This gives the x-intercepts: , , and .
The x-intercepts are .Find the stationary points.
First, find the first derivative :
Set to find the x-coordinates of the stationary points:
Using the quadratic formula :
The x-coordinates are:
Now, find the corresponding y-coordinates by substituting these values back into :
For :Stationary point 1: .
For :
Stationary point 2: .
Determine the nature of the stationary points.
Find the second derivative :
Evaluate at each stationary point:
For :Since , is a local minimum.
For :
Since , is a local maximum.
The stationary points are .
Find the point of inflection.
Set :
Now, find the corresponding y-coordinate by substituting into :
The point of inflection is .
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