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Which of the following is NOT a polynomial?

A)4/x+x/7

B)x^-4

C)-4/7

D)x^2-4+7x

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Roman C. | Masters of Education Graduate with Mathematics ExpertiseMasters of Education Graduate with Mathe...
4.9 4.9 (253 lesson ratings) (253)
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A and B are not polynomials because they each include one term that has a negative exponent

(Note: 4/x = 4x-1).

C and D are polynomials (C is constant, D is quadratic).

 

Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
4.6 4.6 (13 lesson ratings) (13)
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Answer: B), since the exponent cannot be negative for a polynomial.