256 × 256 - 144 × 144112 is equal to = ?

Answer: Option B

$$\begin{array}{rl}& \frac{256\times 256-144\times 144}{112}\\ & =\frac{{\left(256\right)}^2-{\left(144\right)}^2}{112}\\ & =\frac{\left(112\right)\left(400\right)}{112}\\ & =400\end{array}$$