Math Problem Statement

Given the definitions of f(x) and g(x) below, find the value of f (g(2)). f(x) = x2+6x + 11 9x) = -5x + 1

Solution

To find the value of f(g(2))f(g(2)), we'll first compute g(2)g(2) and then substitute that value into the function f(x)f(x).

  1. Step 1: Compute g(2)g(2) g(x)=5x+1g(x) = -5x + 1 Substituting x=2x = 2: g(2)=5(2)+1=10+1=9g(2) = -5(2) + 1 = -10 + 1 = -9

  2. Step 2: Compute f(g(2))=f(9)f(g(2)) = f(-9) The function f(x)f(x) is given by: f(x)=x2+6x+11f(x) = x^2 + 6x + 11 Now, substitute x=9x = -9 into f(x)f(x): f(9)=(9)2+6(9)+11f(-9) = (-9)^2 + 6(-9) + 11 Simplifying: f(9)=8154+11=38f(-9) = 81 - 54 + 11 = 38

Therefore, the value of f(g(2))f(g(2)) is 38\boxed{38}.

Would you like further details on any step or more explanation?

Here are 5 related questions to expand your understanding:

  1. What would f(g(3))f(g(3)) be for the same functions?
  2. How does changing the function g(x)g(x) affect the overall result of f(g(x))f(g(x))?
  3. Can you calculate f(f(2))f(f(2)) for the given f(x)f(x)?
  4. What is the graphical interpretation of nested functions like f(g(x))f(g(x))?
  5. How would the result change if f(x)f(x) were a linear function instead of quadratic?

Tip: When working with nested functions, always evaluate the inner function first before substituting into the outer function.

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Math Problem Analysis

Mathematical Concepts

Algebra
Composition of Functions
Quadratic Functions
Linear Functions

Formulas

f(x) = x^2 + 6x + 11
g(x) = -5x + 1
Composition of functions: f(g(x))

Theorems

Function Composition

Suitable Grade Level

Grades 9-11