Question

Evaluate {(83)² − (17)²}.

Answer 1

$$\begin{gathered} {\left(83\right)}^2-{\left(17\right)}^2 \\ =\left(83+17\right)\left(83-17\right)[\mathrm{according}\mathrm{to}\mathrm{the}\mathrm{formula}{\left(a\right)}^2-{\left(b\right)}^2=\left(a+b\right)\left(a-b\right)] \\ =\left(100\right)\left(66\right) \\ =6600 \end{gathered}$$