A trinomial
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A polynomial with three terms is called a trinomial. Example: x² + 16 + 18 is a trinomial. It has three terms (x²), (16), and (18)
A trinomial is a polynomial with three terms.
First off, it is NOT A QUINTIC! Typically a polynomial of four or more terms is called "a polynomial of n terms", where n is the number of terms. Only the one, two, and three term polynomials are referred to by a particular naming convention.
That already is a polynomial in standard form.
No, if it is of degree 4, it can have 4 linear factors, regardless of the number of terms.For example, x squared + 5x + 6 = (x+3)(x+2). The unfactored polynomial has three terms, and is of degree 2. Similarly, you can multiply four linear terms together; and you will get a polynomial of degree 4, which has up to 5 terms.