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September 21, 2014

September 21, 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

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