Math Problem Statement

Let f and g be the functions whose graphs are shown below. (a) Find (g ∘ f)(−1), (b) Find (f ∘ g)(4), (c) Find (f ∘ f)(4).

Solution

Let's break down and solve the problem based on the given graph.

The problem involves:

  • Two functions, f(x)f(x) (red curve) and g(x)g(x) (blue curve), whose graphs are shown.
  • We are asked to find three composite function values:
    • (a) (gf)(1)(g \circ f)(-1)
    • (b) (fg)(4)(f \circ g)(4)
    • (c) (ff)(4)(f \circ f)(4)

Step 1: Find the necessary function values from the graph.

(a) (gf)(1)(g \circ f)(-1)

  • This means we first find f(1)f(-1), then use this result to find g(f(1))g(f(-1)).
    • From the graph, when x=1x = -1, the value of f(x)f(x) is f(1)=3f(-1) = 3.
    • Now, find g(3)g(3) by checking the value of g(x)g(x) when x=3x = 3 on the blue graph.
    • From the graph, g(3)=3g(3) = -3.
    • Therefore, (gf)(1)=3(g \circ f)(-1) = -3.

(b) (fg)(4)(f \circ g)(4)

  • This means we first find g(4)g(4), then use this result to find f(g(4))f(g(4)).
    • From the graph, when x=4x = 4, the value of g(x)g(x) is g(4)=1g(4) = 1.
    • Now, find f(1)f(1) by checking the value of f(x)f(x) when x=1x = 1 on the red graph.
    • From the graph, f(1)=3f(1) = 3.
    • Therefore, (fg)(4)=3(f \circ g)(4) = 3.

(c) (ff)(4)(f \circ f)(4)

  • This means we first find f(4)f(4), then use this result to find f(f(4))f(f(4)).
    • From the graph, when x=4x = 4, the value of f(x)f(x) is f(4)=2f(4) = -2.
    • Now, find f(2)f(-2) by checking the value of f(x)f(x) when x=2x = -2 on the red graph.
    • From the graph, f(2)=2f(-2) = 2.
    • Therefore, (ff)(4)=2(f \circ f)(4) = 2.

Final Answers:

  • (a) (gf)(1)=3(g \circ f)(-1) = -3
  • (b) (fg)(4)=3(f \circ g)(4) = 3
  • (c) (ff)(4)=2(f \circ f)(4) = 2

Would you like more details or have any other questions?

Here are 5 related questions for practice:

  1. What is (fg)(0)(f \circ g)(0)?
  2. Find g(g(2))g(g(2)).
  3. What is the value of (gf)(1)(g \circ f)(1)?
  4. If h(x)=f(x)+g(x)h(x) = f(x) + g(x), what is h(2)h(2)?
  5. Find f(g(2))f(g(-2)).

Tip: When working with composite functions, always evaluate the inner function first and then use its result to evaluate the outer function.

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Math Problem Analysis

Mathematical Concepts

Composite Functions
Graph Interpretation
Function Composition

Formulas

(g ∘ f)(x) = g(f(x))
(f ∘ g)(x) = f(g(x))

Theorems

Function Composition Theorem

Suitable Grade Level

Grades 10-12