Question

At most how many zeroes a polynomial of degree $4$ (biquadratic polynomial ) can have?

Answer 1

Definition of Bi-quadratic Polynomial:

A polynomial of the fourth degree.

A polynomial of degree $n\ge 1$ can have at most $n$ real zeroes. A quadratic polynomial can have at most two real zeroes.

Now, since a bi-quadratic polynomial is having a degree of 4, it can have at most 4 zeroes.

Hence,bi-quadratic polynomial can have at most 4 zeroes.