Math Problem Statement

Let h(x) = f(g(x)). Find h'(1), h'(2), h'(3) using the graph of f(x) (black, sharp corner at x=2) and g(x) (blue).

Solution

We are asked to find the values of h(x)h'(x) where h(x)=f(g(x))h(x) = f(g(x)), using the given graphs of f(x)f(x) (black, with a sharp corner at x=2x = 2) and g(x)g(x) (blue). To calculate these derivatives, we'll need to apply the chain rule:

h(x)=f(g(x))g(x)h'(x) = f'(g(x)) \cdot g'(x)

Here’s how we can tackle each part:

A. h(1)h'(1)

  1. Step 1: Evaluate g(1)g(1) From the blue graph, at x=1x = 1, g(1)=0g(1) = 0.

  2. Step 2: Find f(g(1))=f(0)f'(g(1)) = f'(0) The black graph shows that f(x)f(x) has a slope of 1 when x=0x = 0, so f(0)=1f'(0) = 1.

  3. Step 3: Find g(1)g'(1) The slope of g(x)g(x) (blue) at x=1x = 1 appears to be constant and negative. From the graph, it looks like g(x)g(x) goes from (0,1)(0,1) to (2,1)(2,-1), which gives a slope: g(x)=1120=1g'(x) = \frac{-1 - 1}{2 - 0} = -1

  4. Step 4: Multiply h(1)=f(g(1))g(1)=1(1)=1h'(1) = f'(g(1)) \cdot g'(1) = 1 \cdot (-1) = -1

B. h(2)h'(2)

  1. Step 1: Evaluate g(2)g(2) From the blue graph, g(2)=1g(2) = 1.

  2. Step 2: Find f(g(2))=f(1)f'(g(2)) = f'(1) The black graph has a constant slope of 1 when x=1x = 1, so f(1)=1f'(1) = 1.

  3. Step 3: Find g(2)g'(2) The slope of g(x)g(x) (blue) at x=2x = 2 is still constant and negative with g(2)=1g'(2) = -1.

  4. Step 4: Multiply h(2)=f(g(2))g(2)=1(1)=1h'(2) = f'(g(2)) \cdot g'(2) = 1 \cdot (-1) = -1

C. h(3)h'(3)

  1. Step 1: Evaluate g(3)g(3) From the blue graph, g(3)=2g(3) = 2.

  2. Step 2: Find f(g(3))=f(2)f'(g(3)) = f'(2) The black graph shows a sharp corner at x=2x = 2, so the derivative f(2)f'(2) does not exist (dne).

  3. Step 3: Conclusion Since f(g(3))f'(g(3)) does not exist, h(3)h'(3) does not exist either.

Thus, the answers are:

  • A. h(1)=1h'(1) = -1
  • B. h(2)=1h'(2) = -1
  • C. h(3)=dneh'(3) = \text{dne}

Would you like more details or have any questions? Here are some related questions:

  1. How do we interpret the sharp corner on a graph?
  2. What is the chain rule, and when do we use it?
  3. How do we find the slope of a line from a graph?
  4. What happens to a composite function’s derivative at a non-differentiable point?
  5. How can we tell when a function’s derivative does not exist?

Tip: Always check if a function has a sharp corner or discontinuity when calculating derivatives, as this can affect differentiability.

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Math Problem Analysis

Mathematical Concepts

Chain Rule
Graph Analysis
Differentiation

Formulas

h'(x) = f'(g(x)) * g'(x)

Theorems

Chain Rule

Suitable Grade Level

Grades 11-12, Calculus