-4x^6 - 2/x
= -(2 (2 x^7 + 1))/x
a polynomial of a single seventh degree variable x
Real root:
x ≈ -0.90572
-2/x = -2x^-1 which has a negative exponent so it's not a polynomial.
It is not a polynomial because one of the terms has x in the denominator. A polynomial must have only positive positive powers of x and numbers.
the 2/x term says this is not a polynomial
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-4x^6 - 2/x
= -(2 (2 x^7 + 1))/x
a polynomial of a single seventh degree variable x
Real root:
x ≈ -0.90572
-2/x = -2x^-1 which has a negative exponent so it's not a polynomial.
It is not a polynomial because one of the terms has x in the denominator. A polynomial must have only positive positive powers of x and numbers.
the 2/x term says this is not a polynomial