Math Problem Statement

  1. Let Find g(n) = —n + 7 and h(n) = -3n + 2. Find (g.h) (2)

Solution

We are given two functions:

  • g(n)=n+7g(n) = -n + 7
  • h(n)=3n+2h(n) = -3n + 2

To find (gh)(2)(g \circ h)(2), we first apply the function h(n)h(n), and then substitute the result into g(n)g(n).

Step 1: Find h(2)h(2)

We substitute n=2n = 2 into h(n)h(n): h(2)=3(2)+2=6+2=4h(2) = -3(2) + 2 = -6 + 2 = -4

Step 2: Find g(h(2))=g(4)g(h(2)) = g(-4)

Now substitute h(2)=4h(2) = -4 into g(n)g(n): g(4)=(4)+7=4+7=11g(-4) = -(-4) + 7 = 4 + 7 = 11

Final answer:

(gh)(2)=11(g \circ h)(2) = 11

Would you like more details or have any questions?

Here are 5 related questions you might find interesting:

  1. How do we interpret the composition of functions geometrically?
  2. What happens when we switch the order of composition: h(g(n))h(g(n))?
  3. How do we find the inverse of a function like g(n)g(n) or h(n)h(n)?
  4. What is the domain of the composition (gh)(n)(g \circ h)(n)?
  5. Can the composition of two linear functions always be another linear function?

Tip: Always apply the innermost function first in function compositions!

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Math Problem Analysis

Mathematical Concepts

Algebra
Function Composition

Formulas

g(n) = -n + 7
h(n) = -3n + 2
(g ∘ h)(n) = g(h(n))

Theorems

Function Composition Theorem

Suitable Grade Level

Grades 9-12