Question

The degree of the polynomial $f\left(x\right)=(x^2-1)(x-3)$ is

Answer 1

$f\left(x\right)=(x^2-1)(x-3)\Rightarrow f\left(x\right)=x^3-3x^2-x+3$
As the highest power is $3$, so the degree of the polynomial is $3$.