- If $f(x)$ is divisible by $(x-a)$, where $a$ is a real number, then $f(a)=0$, and vice versa.
- If $f(x)$ is divisible by $(mx-n)$, where $m$ and $n$ are real numbers and $m\neq 0$, then $f(\dfrac{n}{m})=0$, and vice versa.
Resources for HKDSE Mathematics
