Math Problem Statement

f(x)=4x+5,g(x)=x^2+2,(g∘f)(-1)

Solution

To find (gf)(1)(g \circ f)(-1), we first need to understand the composition of functions. (gf)(x)(g \circ f)(x) means g(f(x))g(f(x)), where we first apply f(x)f(x) and then apply gg to the result of f(x)f(x).

Given:

  • f(x)=4x+5f(x) = 4x + 5
  • g(x)=x2+2g(x) = x^2 + 2

Step 1: Find f(1)f(-1)

We substitute 1-1 into f(x)f(x): [ f(-1) = 4(-1

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Math Problem Analysis

Mathematical Concepts

Function Composition
Linear Functions
Quadratic Functions

Formulas

f(x) = 4x + 5 (Linear function)
g(x) = x^2 + 2 (Quadratic function)
(g ∘ f)(x) = g(f(x)) (Function composition)

Theorems

Function Composition

Suitable Grade Level

Grades 9-11