Math Problem Statement

Find (fog) (x). f(x) = 6x-5 g (x) = -6x + 1 Write your answer as a polynomial in simplest form. (fog) (x)=

Solution

To find (fg)(x)(f \circ g)(x), also written as f(g(x))f(g(x)), we substitute g(x)=6x+1g(x) = -6x + 1 into f(x)f(x).

Given:

  • f(x)=6x5f(x) = 6x - 5
  • g(x)=6x+1g(x) = -6x + 1

Step-by-step solution:

  1. Replace xx in f(x)f(x) with g(x)g(x): f(g(x))=6(6x+1)5f(g(x)) = 6(-6x + 1) - 5

  2. Simplify: f(g(x))=6(6x)+6(1)5f(g(x)) = 6(-6x) + 6(1) - 5 f(g(x))=36x+65f(g(x)) = -36x + 6 - 5

  3. Combine like terms: f(g(x))=36x+1f(g(x)) = -36x + 1

Final Answer:

(fg)(x)=36x+1(f \circ g)(x) = -36x + 1


Would you like further clarification or an alternative explanation?


Related Questions:

  1. How do you find (gf)(x)(g \circ f)(x) for the same functions?
  2. What happens if f(x)f(x) and g(x)g(x) are swapped in composition?
  3. Can the result (fg)(x)(f \circ g)(x) be visualized graphically?
  4. What is the domain of (fg)(x)(f \circ g)(x) given these functions?
  5. How does composition of functions relate to inverse functions?

Tip:

Always check for domain restrictions when composing functions, especially if square roots or fractions are involved.

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Math Problem Analysis

Mathematical Concepts

Function Composition
Polynomial Simplification
Algebra

Formulas

Composition of functions: (f ∘ g)(x) = f(g(x))
Distributive property: a(b + c) = ab + ac

Theorems

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Suitable Grade Level

Grades 9-11