Math Problem Statement

Find the degree, leading coefficient, and limits at infinity for the function f(x) = (2 - x)^7.

Solution

Let's analyze the expression given: f(x)=(2x)7f(x) = (2 - x)^7.

1. Degree:

The degree of a polynomial is the highest power of xx in the expression when expanded. Since (2x)7(2 - x)^7 has an exponent of 7, the degree of this polynomial is: Degree=7\text{Degree} = 7

2. Leading Coefficient:

To find the leading coefficient, expand the term (2x)7(2 - x)^7 and observe the coefficient of the term with the highest power of xx, which is x7x^7. The expansion will produce a term with x-x raised to the 7th power, resulting in x7-x^7. Therefore, the leading coefficient is: Leading Coefficient=1\text{Leading Coefficient} = -1

3. Limits:

For the limits at xx \to -\infty and xx \to \infty, consider the behavior of f(x)=(2x)7f(x) = (2 - x)^7 as xx approaches these values.

  • As xx \to \infty: f(x)=(2x)7(x)7=x7f(x) = (2 - x)^7 \approx (-x)^7 = -x^7 \to -\infty

  • As xx \to -\infty: f(x)=(2x)7(x)7=x7f(x) = (2 - x)^7 \approx (-x)^7 = -x^7 \to \infty

Summary:

  • Degree: 7
  • Leading Coefficient: -1
  • limxf(x)=\lim_{x \to \infty} f(x) = -\infty
  • limxf(x)=\lim_{x \to -\infty} f(x) = \infty

Would you like further details on any specific part?

Here are some related questions to expand your understanding:

  1. How does the sign of the leading coefficient affect the end behavior of a polynomial?
  2. What is the general method for finding the degree and leading coefficient of a polynomial expression?
  3. How would the limits change if the power of xx was even instead of odd?
  4. Can the behavior of limits at infinity differ if we change the base term to a positive expression, like (x+2)7(x + 2)^7?
  5. How can the Binomial Theorem help in expanding expressions like (2x)7(2 - x)^7?

Tip: For polynomial functions, the degree and leading coefficient provide key insights into the function’s growth rate and direction at infinity.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Polynomial functions
Degree of polynomial
Leading coefficient
Limits at infinity

Formulas

Degree of a polynomial function: highest power of x
Leading coefficient: coefficient of the highest degree term in expanded form
Limits at infinity for polynomials

Theorems

End behavior of polynomials based on leading term

Suitable Grade Level

Grades 10-12