Math Problem Statement
Calculate h'(2) for functions h(x) based on given f'(2) = 12 and g'(2) = -1.
Solution
Let's go through the problem step by step to compute h′(2) for each function h(x), given the information:
- f′(2)=12
- g′(2)=−1
(A) h(x)=4f(x)
Using the chain rule:
h′(x)=4f′(x)
Thus, h′(2)=4⋅f′(2)=4⋅12=48.
(B) h(x)=−13g(x)
h′(x)=−13g′(x)
Thus, h′(2)=−13⋅g′(2)=−13⋅(−1)=13.
(C) h(x)=10f(x)+13g(x)
h′(x)=10f′(x)+13g′(x)
Thus, h′(2)=10⋅f′(2)+13⋅g′(2)=10⋅12+13⋅(−1)=120−13=107.
(D) h(x)=12g(x)−7f(x)
h′(x)=12g′(x)−7f′(x)
Thus, h′(2)=12⋅g′(2)−7⋅f′(2)=12⋅(−1)−7⋅12=−12−84=−96.
(E) h(x)=8f(x)+3g(x)−2
The derivative of the constant −2 is zero:
h′(x)=8f′(x)+3g′(x)
Thus, h′(2)=8⋅f′(2)+3⋅g′(2)=8⋅12+3⋅(−1)=96−3=93.
(F) h(x)=−8g(x)−7f(x)−10x
The derivative of −10x is −10:
h′(x)=−8g′(x)−7f′(x)−10
Thus, h′(2)=−8⋅g′(2)−7⋅f′(2)−10=−8⋅(−1)−7⋅12−10=8−84−10=−86.
If you have any questions or need further details, feel free to ask!
Follow-up questions:
- What is the significance of using the chain rule in these derivative calculations?
- How would the answers change if the derivatives f′(2) and g′(2) had different values?
- Why does the derivative of a constant term, like in (E), not affect the result?
- Can you explain why f′(2) and g′(2) are essential for these calculations?
- How do different coefficients (like the 4 in 4f(x)) affect the derivative of h(x)?
Tip:
When dealing with combinations of functions in derivative problems, always apply the chain rule and product rule carefully to avoid mistakes.