To find the derivative h′(x) of the function h(x)=(x−x2)(2x2−x3), we can apply the product rule. The product rule states that if h(x)=f(x)⋅g(x), then:
h′(x)=f′(x)g(x)+f(x)g′(x).
In this case, let's define:
f(x)=x−x2,g(x)=2x2−x3.
Step 1: Find f′(x) and g′(x)
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Compute f′(x):
f(x)=x−x2⟹f′(x)=1−2x.
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Compute g′(x):
g(x)=2x2−x3⟹g′(x)=4x−3x2.
Step 2: Apply the product rule
Using the product rule, we have:
h′(x)=f′(x)g(x)+f(x)g′(x).
Substitute f(x),f′(x),g(x), and g′(x) into the equation:
h′(x)=(1−2x)(2x2−x3)+(x−x2)(4x−3x2).
Step 3: Simplify the expression
Let's expand each term:
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Expand f′(x)g(x):
(1−2x)(2x2−x3)=(1)(2x2−x3)+(−2x)(2x2−x3).
=2x2−x3−4x3+2x4.
=2x2−5x3+2x4.
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Expand f(x)g′(x):
(x−x2)(4x−3x2)=(x)(4x−3x2)+(−x2)(4x−3x2).
=4x2−3x3−4x3+3x4.
=4x2−7x3+3x4.
Step 4: Combine like terms
Now combine both expressions:
h′(x)=(2x2−5x3+2x4)+(4x2−7x3+3x4).
Combine like terms:
h′(x)=(2x2+4x2)+(−5x3−7x3)+(2x4+3x4).
h′(x)=6x2−12x3+5x4.
Final Answer
h′(x)=5x4−12x3+6x2.
Would you like more details on this problem or have any questions?
Here are 5 related questions for further exploration:
- How would you find the second derivative h′′(x) of the function h(x)?
- What are the critical points of the function h(x)?
- Can you determine the intervals where h(x) is increasing or decreasing?
- How can you find the inflection points of h(x)?
- What would the graph of h(x) look like, and where would it have local maxima or minima?
Tip: When dealing with derivatives of products of functions, always consider using the product rule for a structured approach.