Westonci.ca offers fast, accurate answers to your questions. Join our community and get the insights you need now. Ask your questions and receive accurate answers from professionals with extensive experience in various fields on our platform. Our platform provides a seamless experience for finding reliable answers from a network of experienced professionals.

According to the Rational Root Theorem, which number is a potential root of [tex][tex]$f(x) = 9x^8 + 9x^6 - 12x + 7$[/tex][/tex]?

A. 0
B. [tex][tex]$\frac{2}{7}$[/tex][/tex]
C. 2
D. [tex][tex]$\frac{7}{3}$[/tex][/tex]


Sagot :

To determine the potential rational roots of the polynomial [tex]\( f(x) = 9x^8 + 9x^6 - 12x + 7 \)[/tex] using the Rational Root Theorem, we follow a series of steps.

1. Identify the constant term (p) and the leading coefficient (q):
- The constant term [tex]\( p \)[/tex] is 7.
- The leading coefficient [tex]\( q \)[/tex] is 9.

2. Find the factors of the constant term (p):
- The factors of 7 are [tex]\( \pm 1, \pm 7 \)[/tex].

3. Find the factors of the leading coefficient (q):
- The factors of 9 are [tex]\( \pm 1, \pm 3, \pm 9 \)[/tex].

4. Form all possible fractions [tex]\( \frac{p}{q} \)[/tex]:
- Given the factors of [tex]\( p \)[/tex] and [tex]\( q \)[/tex], we form the following potential rational roots:
- [tex]\( \frac{1}{1} \)[/tex], [tex]\( \frac{1}{3} \)[/tex], [tex]\( \frac{1}{9} \)[/tex],
- [tex]\( \frac{7}{1} \)[/tex], [tex]\( \frac{7}{3} \)[/tex], [tex]\( \frac{7}{9} \)[/tex],
- Negative counterparts: [tex]\( -\frac{1}{1} \)[/tex], [tex]\( -\frac{1}{3} \)[/tex], [tex]\( -\frac{1}{9} \)[/tex],
[tex]\( -\frac{7}{1} \)[/tex], [tex]\( -\frac{7}{3} \)[/tex], [tex]\( -\frac{7}{9} \)[/tex].

This results in the set:
[tex]\[ \left\{\pm 1, \pm \frac{1}{3}, \pm \frac{1}{9}, \pm 7, \pm \frac{7}{3}, \pm \frac{7}{9}\right\} \][/tex]

Among these potential roots, we check our given options:
- [tex]\( 0 \)[/tex] (Zero)
- [tex]\( \frac{2}{7} \)[/tex]
- [tex]\( 2 \)[/tex]
- [tex]\( \frac{7}{3} \)[/tex]

From our set of potential rational roots, the fractional root [tex]\( \frac{7}{3} \)[/tex] is indeed present.

Thus, according to the Rational Root Theorem, the number which is a potential root of [tex]\( f(x) = 9x^8 + 9x^6 - 12x + 7 \)[/tex] is:

[tex]\[ \boxed{\frac{7}{3}} \][/tex]
Thank you for visiting. Our goal is to provide the most accurate answers for all your informational needs. Come back soon. Thanks for using our platform. We aim to provide accurate and up-to-date answers to all your queries. Come back soon. We're glad you chose Westonci.ca. Revisit us for updated answers from our knowledgeable team.