197k views
1 vote
Use the rational zeros theorem to list all possible rational zeros for f(x) = -4x - 6x^3 - 9x^4 + 1 + 3x^2.

User Gzost
by
6.7k points

1 Answer

0 votes

Final answer:

The Rational Zeros Theorem allows us to list all potential rational zeros of a polynomial by dividing the factors of the constant term by the factors of the leading coefficient. For f(x) = -9x^4 - 6x^3 + 3x^2 - 4x + 1, the possible rational zeros are ±1, -1, ±3, -1/3, ±9, and -1/9.

Step-by-step explanation:

The Rational Zeros Theorem is a useful tool when we want to list all possible rational zeros for a polynomial function. For the function f(x) = -4x - 6x^3 - 9x^4 + 1 + 3x^2, we first need to rewrite it in standard form as f(x) = -9x^4 - 6x^3 + 3x^2 - 4x + 1. According to the theorem, the potential rational zeros are all the factors of the constant term (here, +1) divided by the factors of the leading coefficient (here, -9).

To find these factors, we look at the integer divisors of +1 and -9.

  • Factors of +1: ±1
  • Factors of -9: ±1, ±3, ±9

Combining these factors, the possible rational zeros include ±1, ±1/3, ±1/9. Remember, each of these could be positive or negative yielding a total list of possible rational zeros as: ±1, -1, ±3, -1/3, ±9, and -1/9.

After listing these possible zeros, you would typically proceed to use synthetic division or other methods to test which, if any, of these candidates are actual zeros of the polynomial.

User Yash Sampat
by
6.9k points