A real number $\alpha$ will be called the zero of the quadratic polynomial $a{x}^2+bx+c$ if  is equal to zero.

A linear polynomial has one and only one _____.

Zeroes of the polynomial $2x^2+8x+8$ are _____ and $-2$.

If the graph of a polynomial intersects the x-axis at three points, then it contains _____ zeroes.

The zeroes of the polynomial  $x^2-64$ are _____.

The value of the quadratic polynomial $x^2-5x+4$ for  $x=-1$ is _____.

A polynomial of degree $n$ has at most _____  zeroes.