Evalute: ( 2.39 )^2 - ( 1.61 )^22.39 - 1.61

Answer: Option B

$$\begin{array}{rl}& \text{Let }a=2.39\text{ and }b=1.61\\ & \text{Given Expression}\\ & =\frac{a^2-b^2}{a-b}\\ & =\frac{\left(a+b\right)\left(a-b\right)}{a-b}\\ & =a+b\\ & =2.39+1.61\\ & =4\end{array}$$