Answer
$9 + 5i\sqrt{3}$
Work Step by Step
Regroup then simplify by combining like terms to obtain
$=(2+7) + (i\sqrt{3}+4i\sqrt{3})
\\= 9 + (i+4i)\sqrt{3}
\\=9 + 5i\sqrt{3}$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 570: 31
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