Math Problem Statement

What is (f ⋅ g)(x) given that f(x) = 3x - 10 and g(x) = 2x^2 - 4x + 3?

Solution

The problem asks you to find (fg)(x)(f \cdot g)(x) given two functions f(x)=3x10f(x) = 3x - 10 and g(x)=2x24x+3g(x) = 2x^2 - 4x + 3.

The operation (fg)(x)(f \cdot g)(x) represents the product of the functions f(x)f(x) and g(x)g(x), which means:

(fg)(x)=f(x)g(x)(f \cdot g)(x) = f(x) \cdot g(x)

Substituting the given functions:

(fg)(x)=(3x10)(2x24x+3)(f \cdot g)(x) = (3x - 10) \cdot (2x^2 - 4x + 3)

To multiply these expressions, distribute 3x103x - 10 over each term in 2x24x+32x^2 - 4x + 3:

(fg)(x)=3x2x2+3x(4x)+3x3102x210(4x)103(f \cdot g)(x) = 3x \cdot 2x^2 + 3x \cdot (-4x) + 3x \cdot 3 - 10 \cdot 2x^2 - 10 \cdot (-4x) - 10 \cdot 3

Now, calculate each term:

(fg)(x)=6x312x2+9x20x2+40x30(f \cdot g)(x) = 6x^3 - 12x^2 + 9x - 20x^2 + 40x - 30

Combine like terms:

(fg)(x)=6x332x2+49x30(f \cdot g)(x) = 6x^3 - 32x^2 + 49x - 30

So the expression for (fg)(x)(f \cdot g)(x) in standard form is:

(fg)(x)=6x332x2+49x30(f \cdot g)(x) = 6x^3 - 32x^2 + 49x - 30

Would you like any further details or have any questions?

Here are 5 related questions you might consider:

  1. How do you differentiate the function (fg)(x)=6x332x2+49x30(f \cdot g)(x) = 6x^3 - 32x^2 + 49x - 30?
  2. What is the result of f(x)+g(x)f(x) + g(x) for the given functions?
  3. How would you solve (fg)(x)=0(f \cdot g)(x) = 0 for xx?
  4. Can you factor the expression 6x332x2+49x306x^3 - 32x^2 + 49x - 30?
  5. What is the domain of the function (fg)(x)(f \cdot g)(x)?

Tip: Always check your final expression by re-expanding the factors to ensure the multiplication was done correctly.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Algebra
Functions
Polynomial Multiplication

Formulas

(f ⋅ g)(x) = f(x) ⋅ g(x)
Distribution of polynomials

Theorems

Polynomial Multiplication Theorem

Suitable Grade Level

Grades 9-11