Home > A2C > Chapter 9 > Lesson 9.3.2 > Problem9-143

9-143.

Use by the conjugate to rationalize the denominator.

$\frac{(2-5\textit{i})(1+2\textit{i})}{(1-2\textit{i})(1+2\textit{i})}$

$\frac{12}{5}-\frac{1}{5}\textit{i}$

See part (a).