Math Problem Statement

Let f(x) = 3x - 1, h(x) = -x + 1. Find (h o f)(4).

Solution

We are given the functions f(x)=3x1f(x) = 3x - 1 and h(x)=x+1h(x) = -x + 1, and asked to find (hf)(4)(h \circ f)(4), which means we need to find h(f(4))h(f(4)).

Step-by-step solution:

  1. Find f(4)f(4): f(x)=3x1f(x) = 3x - 1 Substitute x=4x = 4: f(4)=3(4)1=121=11f(4) = 3(4) - 1 = 12 - 1 = 11

  2. Find h(f(4))=h(11)h(f(4)) = h(11): h(x)=x+1h(x) = -x + 1 Substitute x=11x = 11: h(11)=(11)+1=11+1=10h(11) = -(11) + 1 = -11 + 1 = -10

Thus, (hf)(4)=10(h \circ f)(4) = -10.

Would you like further explanation or details on any step?


Here are 5 related questions:

  1. What is (fh)(4)(f \circ h)(4)?
  2. How do you find the composition of two functions in general?
  3. What is the result of (hf)(x)(h \circ f)(x) for a general xx?
  4. If f(x)=2x+3f(x) = 2x + 3 and h(x)=x21h(x) = x^2 - 1, what is (hf)(2)(h \circ f)(2)?
  5. Can you explain the graphical interpretation of h(f(x))h(f(x))?

Tip: Always check your composition step-by-step, starting with the innermost function first!

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Math Problem Analysis

Mathematical Concepts

Algebra
Function Composition

Formulas

f(x) = 3x - 1
h(x) = -x + 1

Theorems

Function Composition

Suitable Grade Level

Grades 9-11