Math Problem Statement

Given the definitions of f(x) and g(x), find the value of (f ∘ g)(-3).

Solution

We are asked to find the value of (fg)(3)(f \circ g)(-3), which is the composition of the functions f(x)f(x) and g(x)g(x) at the input x=3x = -3.

Given: f(x)=3x27x3f(x) = 3x^2 - 7x - 3 g(x)=4x10g(x) = -4x - 10

The composition of functions (fg)(x)(f \circ g)(x) means we first apply g(x)g(x), then use the result as the input for f(x)f(x). So, we need to find g(3)g(-3) first, and then plug that into f(x)f(x).

Step 1: Calculate g(3)g(-3)

g(3)=4(3)10=1210=2g(-3) = -4(-3) - 10 = 12 - 10 = 2

Step 2: Calculate f(g(3))=f(2)f(g(-3)) = f(2)

Now, substitute x=2x = 2 into the function f(x)f(x): f(2)=3(2)27(2)3f(2) = 3(2)^2 - 7(2) - 3 f(2)=3(4)143=12143=5f(2) = 3(4) - 14 - 3 = 12 - 14 - 3 = -5

Thus, (fg)(3)=5(f \circ g)(-3) = -5.

Would you like more details or have any other questions?

Here are 5 related questions:

  1. What is the general process of composing two functions?
  2. How would the result change if we composed gf(x)g \circ f(x) instead of fg(x)f \circ g(x)?
  3. How can you verify the result using another method?
  4. What happens to the composition of functions if one function is non-invertible?
  5. Can you generalize the composition to other polynomial functions?

Tip: Always double-check each function's evaluation step, especially when handling negative inputs and powers.

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Math Problem Analysis

Mathematical Concepts

Function Composition
Algebra
Quadratic Functions

Formulas

f(x) = 3x^2 - 7x - 3
g(x) = -4x - 10
(f ∘ g)(x) = f(g(x))

Theorems

Function Composition Theorem

Suitable Grade Level

Grades 9-12