Which statement best describes the equation x to the 5th power plus x cubed minus 14 is equal to 0 ?

A polynomial is quadratic in form when its exponents can be written as 2n, n, and 0, allowing a substitution to make it a quadratic. Here the nonconstant exponents are 5 and 3; they do not have that relationship, so the equation cannot be rewritten as a second-degree polynomial by substitution. Thus, the statement that it is not quadratic in form is correct.

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