Math Problem Statement

Find (f - g)(x) where f(x) = x^2 - 4x and g(x) = 3x - 5.

Solution

The problem asks to find (fg)(x)(f - g)(x), where:

f(x)=x24xf(x) = x^2 - 4x g(x)=3x5g(x) = 3x - 5

Solution:

(fg)(x)(f - g)(x) is defined as:

(fg)(x)=f(x)g(x)(f - g)(x) = f(x) - g(x)

Substituting the given functions:

(fg)(x)=(x24x)(3x5)(f - g)(x) = (x^2 - 4x) - (3x - 5)

Simplify:

(fg)(x)=x24x3x+5(f - g)(x) = x^2 - 4x - 3x + 5

Combine like terms:

(fg)(x)=x27x+5(f - g)(x) = x^2 - 7x + 5

Final Answer:

(fg)(x)=x27x+5(f - g)(x) = x^2 - 7x + 5

Would you like a deeper explanation or more examples?

5 Related Questions:

  1. What is the result of (f+g)(x)(f + g)(x) for the same functions?
  2. How do you compute (fg)(x)(fg)(x), the product of two functions?
  3. What is the domain of the resulting function (fg)(x)(f - g)(x)?
  4. How do you find the derivative of (fg)(x)(f - g)(x)?
  5. How would the result change if g(x)g(x) were a quadratic function instead of linear?

Tip:

When subtracting functions, always distribute the negative sign carefully to avoid errors!

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Math Problem Analysis

Mathematical Concepts

Function subtraction
Simplifying algebraic expressions

Formulas

(f - g)(x) = f(x) - g(x)

Theorems

Basic arithmetic operations on functions

Suitable Grade Level

Grades 9-11