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Use the rational zeros theorem to list all possible rational zeros of the following. \[ h(x)=-3 x^{3}-3 x^{2}-x-7 \] Be sure that no value in your list appears more than once. (I)

Ask by Santiago Barker. in the United States
Feb 04,2025

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Tutor-Verified Answer

Answer

All possible rational zeros are ±1, ±1⁄3, ±7, and ±7⁄3.

Solution

To list all possible rational zeros of the polynomial \( h(x) = -3x^3 - 3x^2 - x - 7 \) using the **Rational Zero Theorem**, follow these steps: 1. **Identify the Constant Term and Leading Coefficient:** - **Constant Term (a₀):** \(-7\) - **Leading Coefficient (aₙ):** \(-3\) 2. **Determine the Factors:** - **Factors of the Constant Term (\(p\)):** \(\pm 1, \pm 7\) - **Factors of the Leading Coefficient (\(q\)):** \(\pm 1, \pm 3\) 3. **Form Possible Rational Zeros (\(\frac{p}{q}\)):** - Combine each factor of the constant term with each factor of the leading coefficient. - Simplify each fraction to its lowest terms. 4. **List All Possible Rational Zeros:** \[ \pm 1, \pm \frac{1}{3}, \pm 7, \pm \frac{7}{3} \] **Final List of Possible Rational Zeros:** \[ -7,\ -\frac{7}{3},\ -1,\ -\frac{1}{3},\ \frac{1}{3},\ 1,\ \frac{7}{3},\ 7 \] **Alternatively, expressed with ± notation:** \[ \pm 1,\ \pm \frac{1}{3},\ \pm 7,\ \pm \frac{7}{3} \] These are all the possible rational zeros of the given polynomial according to the Rational Zero Theorem. **Answer:** All rational numbers ±1, ±1⁄3, ±7, and ±7⁄3 are possible zeros of h (x)

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Bonus Knowledge

To apply the rational zeros theorem, we first need the coefficients of the polynomial \( h(x) = -3x^3 - 3x^2 - x - 7 \). The leading coefficient here is -3, and the constant term is -7. The possible rational zeros can be found by taking the factors of the constant term and dividing them by the factors of the leading coefficient. Factors of -7: ±1, ±7 Factors of -3: ±1, ±3 Now, we combine these to form the list of potential rational zeros by dividing factors of -7 by factors of -3: Possible rational zeros: ±1, ±7, ±1/3, ±7/3. So, all possible rational zeros of \( h(x) \) are: 1, -1, 7, -7, 1/3, -1/3, 7/3, -7/3.

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