What is the value of $\displaystyle\frac{235^2-221^2}{14}$?
To solve this, we should use the difference of squares. Ok. So we have $\displaystyle\frac{(235+221)(235-221)}{14}$. Yes. And $(235+221)$ is equal to $456$. And $(235-221)$ is equal to $14$. So we have $\displaystyle\frac{456*14}{14}$. Yes. That simplifies to $456$. So, the value of $\displaystyle\frac{235^2-221^2}{14}$ is $456$.

