16 Given that $\alpha+\beta=17$ and $\alpha \beta=70$, find the value of $|\alpha-\beta|$.
16. Answer: 3
Note that $\alpha$ and $\beta$ are the roots of the equation $x^{2}-17 x+70=0$. Solving we have $x=7$ or 10 . Hence $|\alpha-\beta|=3$.