Math Problem Statement

Use f(x) = 5x - 2 and g(x) = 3 - x^2 to evaluate the expressions f(f(2)) and g(g(3)).

Solution

The image shows two functions:

  • f(x)=5x2f(x) = 5x - 2
  • g(x)=3x2g(x) = 3 - x^2

You are asked to evaluate the following expressions:

  1. f(f(2))f(f(2))
  2. g(g(3))g(g(3))

(a) f(f(2))f(f(2))

First, calculate f(2)f(2): f(2)=5(2)2=102=8f(2) = 5(2) - 2 = 10 - 2 = 8

Next, substitute 88 into f(x)f(x) again: f(f(2))=f(8)=5(8)2=402=38f(f(2)) = f(8) = 5(8) - 2 = 40 - 2 = 38

So, f(f(2))=38f(f(2)) = 38.

(b) g(g(3))g(g(3))

First, calculate g(3)g(3): g(3)=332=39=6g(3) = 3 - 3^2 = 3 - 9 = -6

Next, substitute 6-6 into g(x)g(x): g(g(3))=g(6)=3(6)2=336=33g(g(3)) = g(-6) = 3 - (-6)^2 = 3 - 36 = -33

So, g(g(3))=33g(g(3)) = -33.

Let me know if you'd like more details or if you have any questions!

Here are some related questions to expand the discussion:

  1. What is the domain and range of the function f(x)f(x)?
  2. How would you find the inverse of g(x)=3x2g(x) = 3 - x^2?
  3. What happens if you compose g(f(x))g(f(x)) instead of f(g(x))f(g(x))?
  4. How would you approach solving f(f(x))=0f(f(x)) = 0?
  5. What is the effect of composing two quadratic functions?

Tip: When working with compositions of functions, it's important to solve them step by step and substitute carefully.

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Math Problem Analysis

Mathematical Concepts

Function Composition
Quadratic Functions
Linear Functions

Formulas

f(x) = 5x - 2
g(x) = 3 - x^2

Theorems

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Suitable Grade Level

Grades 9-11