Math Problem Statement

Find (f ∘ g)(x) based on the given functions: f(x) = (3/2)x + 1 and g(x) = x^2 - 5x.

Solution

You’ve provided two images. The first image defines four functions, and the second image presents a composition of functions question. Let’s break it down:

Functions provided:

  1. f(x)=32x+1f(x) = \frac{3}{2}x + 1
  2. g(x)=x25xg(x) = x^2 - 5x
  3. h(x)=2x133h(x) = \frac{2x - 1}{33}
  4. j(x)=3x+1j(x) = 3x + 1

Question:

Find (fg)(x)(f \circ g)(x), which means the composition of f(x)f(x) and g(x)g(x), or in simpler terms, f(g(x))f(g(x)).

Solution:

To find (fg)(x)=f(g(x))(f \circ g)(x) = f(g(x)), we substitute g(x)g(x) into f(x)f(x).

  1. Recall: f(x)=32x+1f(x) = \frac{3}{2}x + 1 So, to compute f(g(x))f(g(x)), replace xx in f(x)f(x) with g(x)g(x), which is x25xx^2 - 5x.

  2. Substitution: f(g(x))=32(x25x)+1f(g(x)) = \frac{3}{2}(x^2 - 5x) + 1

  3. Now, distribute the 32\frac{3}{2} to each term inside the parentheses: f(g(x))=32x2152x+1f(g(x)) = \frac{3}{2}x^2 - \frac{15}{2}x + 1

Thus, the final expression for (fg)(x)(f \circ g)(x) is: (fg)(x)=32x2152x+1(f \circ g)(x) = \frac{3}{2}x^2 - \frac{15}{2}x + 1

Would you like a further explanation or to go through additional examples?

5 Related Questions:

  1. What is (gf)(x)(g \circ f)(x)?
  2. How do you find (hj)(x)(h \circ j)(x)?
  3. What happens if you compose f(x)f(x) with itself, (ff)(x)(f \circ f)(x)?
  4. How would you solve f(g(2))f(g(2))?
  5. How do you find the inverse of the function f(x)f(x)?

Tip:

When composing functions, always substitute one function into the other carefully, and simplify step by step to avoid errors.

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Math Problem Analysis

Mathematical Concepts

Function Composition
Algebra
Quadratic Functions

Formulas

f(x) = (3/2)x + 1
g(x) = x^2 - 5x
Composition: (f ∘ g)(x) = f(g(x))

Theorems

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Suitable Grade Level

Grades 10-12