Math Problem Statement

F(×)=3×-5 g(×)=2ײ-5: find f(g(×)

Solution

You are asked to find f(g(x))f(g(x)) where:

  • f(x)=3x5f(x) = 3x - 5
  • g(x)=2x25g(x) = 2x^2 - 5

To find f(g(x))f(g(x)), we will substitute g(x)g(x) into f(x)f(x).

Steps:

  1. First, recall that f(x)=3x5f(x) = 3x - 5.
  2. Replace xx in f(x)f(x) with g(x)g(x): f(g(x))=3(2x25)5f(g(x)) = 3(2x^2 - 5) - 5
  3. Now simplify the expression: f(g(x))=3(2x25)5=6x2155f(g(x)) = 3(2x^2 - 5) - 5 = 6x^2 - 15 - 5 f(g(x))=6x220f(g(x)) = 6x^2 - 20

Thus, f(g(x))=6x220f(g(x)) = 6x^2 - 20.

Would you like more details on the steps or explanations?

Here are five related questions:

  1. How do you find g(f(x))g(f(x))?
  2. What is the general method for solving composite functions?
  3. How would you determine the domain of f(g(x))f(g(x))?
  4. Can composite functions be inverse functions of each other?
  5. How can we graph f(g(x))f(g(x))?

Tip: Always simplify composite functions step-by-step to avoid mistakes.

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Math Problem Analysis

Mathematical Concepts

Composite Functions
Quadratic Equations
Function Substitution

Formulas

f(x) = 3x - 5
g(x) = 2x² - 5
f(g(x)) = 6x² - 20

Theorems

Composite Function Theorem

Suitable Grade Level

Grades 9-11