Saturday

August 23, 2014

August 23, 2014

Posted by **Alg help** on Tuesday, November 23, 2010 at 1:57am.

(a) By using the Rational Zero Theorem, list all possible rational zeros of the given polynomial.

(b) Find all of the zeros of the given polynomial. Be sure to show work, explaining how you have found them.

- Algebra -
**drwls**, Tuesday, November 23, 2010 at 6:40amPlease use a ^ before exponents.

f(x) = 3x^3 -2x^2 -7x -2

The rational zeros are the rational values of x for which f(x) = 0.

Possible (but not necessarily valid)roots are x = +or- 1/3, 2/3, 1, or 2. One of those values that works is x = -1. That means one of the factors of the polynomial is (x+1).

The other factor is

(3x^3 -2x^2 -7x -2)/(x+1)

Synthetic long division will show that factor to be

3x^2 -5x -2 = 0

Use the quadratic formula to solve for the other two roots.

x = (1/6)[5 +/- sqrt(25 +24)]

= (1/6)(12 or -2)

= 2 or -1/3

**Related Questions**

algebra - Consider the polynomial f(x) = 3x3 – 2x2 – 7x – 2. (a) By using the ...

algebra - Consider the polynomial f(x) = 3x3 – 2x2 – 7x – 2. (a) By using the ...

Algebra - Consider the polynomial: f(x) = 2x^3 – 3x^2 – 8x – 3. (a) By using the...

Math - Consider the polynomial f(x) = 2x^3 – 3x^2 – 8x – 3. (a) By using the ...

Algebra - Can someone please explain how to do these problems. 1)write a ...

algebra - use the rational zero theorem to list the potential rational zeros of ...

Rational Zeros - List all possible rational zeros for the polynomial below. Find...

algebra - list all the possible rational zeros of f using the rational zero ...

algebra - Use the rational zero theorem to list all possible rational zeros for ...

Precalculus - I'm HOPING this is the last problem I need help on.. :-/ List the ...