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Which of the following is a possible rational zero for the polynomial

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Which of the following is a possible rational zero for the polynomial 6x3 + 9x2 - 3x + 2?
A. -6
B. -3
C. 0
D. 2

 

asked Sep 3, 2014 in ALGEBRA 2 by tonymate Pupil

1 Answer

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Best answer

Identify Rational Zeros :

Usually it is not practical to test all possible zeros of a polynomial function using only synthetic substitution. The Rational Zero Theorem can be used for finding the some possible zeros to test.

Rational Root Theorem, if a rational number in simplest form p/q is a root of the polynomial equation anx n + an  1x n – 1 + ... + a1x + a0 = 0, then p is a factor of a0 and q is a factor if an.

The function is 6x3 + 9x2 - 3x + 2

If p/q is a rational zero, then p is a factor of 2 and q is a factor of 6.

The possible values of p are   ± 1 and ± 2.

The possible values for q are ± 1 ,± 2 and ± 3

By the Rational Roots Theorem, the only possible rational roots are, p / q = ± 1, ± 2 ,± 2/3 ,± 1/3 and ± 1/2.

Therefore, the Rational zeros are ± 1, ± 2 ,± 2/3 ,± 1/3 and ± 1/2.

The option D is correct.

 

answered Sep 4, 2014 by bradely Mentor
selected Sep 4, 2014 by tonymate

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