L H.

asked • 05/20/15

What type of polynomial is x(x - 4)(x - 5)?

  I think it is a trinomial, but I am not sure... 

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Mark M. answered • 05/20/15

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At the present what is presented is three factors, it is not a polynomial. Polynomials are monomials joined by addition or subtraction.
 
x(x - 4)(x - 5)
x(x2 - 4x - 5x + 20)
x(x2 - 9x + 20)
x3 - 9x2 + 20x                Now it is a polynomial, specifically a trinomial.
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Stephanie M.

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More specifically, this is a cubic trinomial. It has three terms (trinomial), and the highest exponent is 3 (cubic).
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05/20/15

Mark M.

Thank you for the elaboration.
 
Mark
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05/21/15

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