Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.6 - Complex Numbers - 1.6 Exercises - Page 64: 16


The real part of the complex number $2-\sqrt -5$ is 2, and the imaginary part is $-\sqrt 5$.

Work Step by Step

Complex numbers are written in the form a+bi, with a being the real number and b being the imaginary number. Since, in this case, a=2, 2 is the real part of the complex number. b=$-\sqrt 5$, because $-\sqrt -5 = i*-\sqrt 5$ since $i=\sqrt -1$. Therefore the imaginary part (b) of the complex number = -5.
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