Math Problem Statement

Find (f ∘ g)(-5) using the graphs of f(x) and g(x), where the blue and black curves represent f(x) and g(x), respectively.

Solution

The problem asks to find (fg)(5)(f \circ g)(-5), which is the composition of the functions f(x)f(x) and g(x)g(x), evaluated at 5-5.

Steps:

  1. Understand the composition: (fg)(x)=f(g(x))(f \circ g)(x) = f(g(x)). We need to first evaluate g(5)g(-5), then use that result to find f(g(5))f(g(-5)).

  2. Find g(5)g(-5): From the graph, the black curve represents g(x)g(x). At x=5x = -5, follow the curve to the y-value.

    • Looking at the graph, the black curve passes through (5,4)(-5, 4), so g(5)=4g(-5) = 4.
  3. Find f(g(5))=f(4)f(g(-5)) = f(4): Now, use the blue curve (representing f(x)f(x)) to find f(4)f(4).

    • From the graph, the blue curve passes through (4,4)(4, -4), so f(4)=4f(4) = -4.

Thus, (fg)(5)=f(g(5))=f(4)=4(f \circ g)(-5) = f(g(-5)) = f(4) = -4.

Final Answer:

(fg)(5)=4(f \circ g)(-5) = -4

Would you like more details or have any questions? Here are five related questions to consider:

  1. How do you determine g(x)g(x) and f(x)f(x) values from a graph?
  2. What are the properties of function composition?
  3. Can you explain how to graphically interpret (fg)(x)(f \circ g)(x)?
  4. How does the domain of a composite function differ from individual functions?
  5. What happens if a graph is not continuous—how does that affect composition?

Tip: Always follow the correct order when solving function compositions: evaluate the inner function first before applying the outer function.

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Math Problem Analysis

Mathematical Concepts

Function Composition
Quadratic Functions
Graph Interpretation

Formulas

(f ∘ g)(x) = f(g(x))

Theorems

Function Composition Theorem

Suitable Grade Level

Grades 9-12