Question

Evaluate using suitable identity: (98)2

Answer 1

$$\begin{gathered} {\left(98\right)}^2 \\ ={\left(100-2\right)}^2 \\ ={\left(100\right)}^2+{\left(2\right)}^2-2\left(100\right)\left(2\right) \\ =10000+4-400 \\ =10004-400 \\ =9604 \end{gathered}$$