Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 4 Quadratic Functions and Factoring - Chapter Test - Page 323: 17

Answer

$$16-3i$$

Work Step by Step

Using the rules of complex numbers and combining like terms: $$\left(2-7i\right)\left(1+2i\right) \\ \left(2\cdot \:1-\left(-7\right)\cdot \:2\right)+\left(2\cdot \:2+\left(-7\right)\cdot \:1\right)i \\ 16-3i$$
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