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Quppose that \( f(1)=1, f^{\prime}(1)=5, g(1)=1 \), and \( g^{\prime}(1)=-6 \). If \( F(x)=(f \circ g)(x) \) and \( G(x)=(g \circ f)(x) \), find \( F^{\prime}(1)+G^{\prime}(1) \).

Ask by Wilson Robbins. in the United States
Feb 25,2025

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Tutor-Verified Answer

Answer

\( F^{\prime}(1) + G^{\prime}(1) = -60 \)

Solution

We are given the following information:   f(1) = 1, f′(1) = 5,   g(1) = 1, g′(1) = –6. Let F(x) = (f ∘ g)(x) = f(g(x)) and G(x) = (g ∘ f)(x) = g(f(x)). Step 1. Differentiate F(x) using the chain rule:   F′(x) = f′(g(x)) · g′(x). At x = 1:   F′(1) = f′(g(1)) · g′(1) = f′(1) · (–6) = 5 · (–6) = –30. Step 2. Differentiate G(x) using the chain rule:   G′(x) = g′(f(x)) · f′(x). At x = 1:   G′(1) = g′(f(1)) · f′(1) = g′(1) · 5 = (–6) · 5 = –30. Step 3. Add the derivatives:   F′(1) + G′(1) = –30 + (–30) = –60. Thus, the final answer is –60.

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The Deep Dive

To find \( F'(1) + G'(1) \), we will need to apply the chain rule to \( F(x) = (f \circ g)(x) \) and \( G(x) = (g \circ f)(x) \). First, let's compute \( F'(x) \). \[ F'(x) = (f \circ g)'(x) = f'(g(x)) \cdot g'(x) \] Now, we can evaluate \( F'(1) \): \[ F'(1) = f'(g(1)) \cdot g'(1) \] Given \( g(1) = 1 \), we have: \[ F'(1) = f'(1) \cdot g'(1) \] Substituting the known values: \[ F'(1) = 5 \cdot (-6) = -30 \] Next, we compute \( G'(x) \). \[ G'(x) = (g \circ f)'(x) = g'(f(x)) \cdot f'(x) \] Now, we can evaluate \( G'(1) \): \[ G'(1) = g'(f(1)) \cdot f'(1) \] Since \( f(1) = 1 \), we get: \[ G'(1) = g'(1) \cdot f'(1) \] Substituting in the known values: \[ G'(1) = -6 \cdot 5 = -30 \] Now we can combine \( F'(1) \) and \( G'(1) \): \[ F'(1) + G'(1) = -30 + (-30) = -60 \] Thus, the value of \( F'(1) + G'(1) \) is: \[ \boxed{-60} \]

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